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21012221210 = 252101222121
BaseRepresentation
bin10011100100011011…
…010000110100011010
32000020101012102201012
4103210123100310122
5321013112034320
613353004453522
71342462635101
oct234433206432
960211172635
1021012221210
118a0293a882
1240a4b4a2a2
131c9b3036b6
1410348d5038
1582ea634c5
hex4e46d0d1a

21012221210 has 8 divisors (see below), whose sum is σ = 37821998196. Its totient is φ = 8404888480.

The previous prime is 21012221207. The next prime is 21012221311. The reversal of 21012221210 is 1212221012.

Adding to 21012221210 its reverse (1212221012), we get a palindrome (22224442222).

It can be written as a sum of positive squares in 2 ways, for example, as 18294997081 + 2717224129 = 135259^2 + 52127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050611051 + ... + 1050611070.

Almost surely, 221012221210 is an apocalyptic number.

21012221210 is a deficient number, since it is larger than the sum of its proper divisors (16809776986).

21012221210 is a wasteful number, since it uses less digits than its factorization.

21012221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101222128.

The product of its (nonzero) digits is 32, while the sum is 14.

The spelling of 21012221210 in words is "twenty-one billion, twelve million, two hundred twenty-one thousand, two hundred ten".

Divisors: 1 2 5 10 2101222121 4202444242 10506110605 21012221210