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2121221212 = 221153039091
BaseRepresentation
bin111111001101111…
…0100010001011100
312110211110012110121
41332123310101130
513321013034322
6550253044324
7103365040255
oct17633642134
95424405417
102121221212
11999412990
124b24866a4
1327a60b0a6
14161a11b2c
15c6359ec7
hex7e6f445c

2121221212 has 24 divisors (see below), whose sum is σ = 4050813312. Its totient is φ = 963903600.

The previous prime is 2121221209. The next prime is 2121221227.

It is a happy number.

2121221212 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228787 + ... + 237877.

It is an arithmetic number, because the mean of its divisors is an integer number (168783888).

Almost surely, 22121221212 is an apocalyptic number.

2121221212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2121221212 is a deficient number, since it is larger than the sum of its proper divisors (1929592100).

2121221212 is a wasteful number, since it uses less digits than its factorization.

2121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14409 (or 14407 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 2121221212 is about 46056.7173385164. The cubic root of 2121221212 is about 1284.8782782248.

It can be divided in two parts, 21212 and 21212, that added together give a palindrome (42424).

The spelling of 2121221212 in words is "two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".

Divisors: 1 2 4 11 22 44 5303 9091 10606 18182 21212 36364 58333 100001 116666 200002 233332 400004 48209573 96419146 192838292 530305303 1060610606 2121221212