21121322210 has 16 divisors (see below), whose sum is σ = 38085918336. Its totient is φ = 8433520368.

The previous prime is 21121322207. The next prime is 21121322219. The reversal of 21121322210 is 1222312112.

It is a super-2 number, since 2×21121322210² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21121322219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1870154 + ... + 1881413.

It is an arithmetic number, because the mean of its divisors is an integer number (2380369896).

Almost surely, 2^21121322210 is an apocalyptic number.

21121322210 is a deficient number, since it is larger than the sum of its proper divisors (16964596126).

21121322210 is a wasteful number, since it uses less digits than its factorization.

21121322210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752137.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121322210 its reverse (1222312112), we get a palindrome (22343634322).

The spelling of 21121322210 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-two thousand, two hundred ten".