21122001211210 has 8 divisors (see below), whose sum is σ = 38019602180196. Its totient is φ = 8448800484480.

The previous prime is 21122001211169. The next prime is 21122001211229. The reversal of 21122001211210 is 1211210022112.

It can be written as a sum of positive squares in 2 ways, for example, as 17516677495849 + 3605323715361 = 4185293^2 + 1898769^2 .

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

It is a super-2 number, since 2×21122001211210² (a number of 27 digits) contains 22 as substring.

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, 1056100060551 + ... + 1056100060570.

Almost surely, 2^{21122001211210} is an apocalyptic number.

21122001211210 is a deficient number, since it is larger than the sum of its proper divisors (16897600968986).

21122001211210 is a wasteful number, since it uses less digits than its factorization.

21122001211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112200121128.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21122001211210 its reverse (1211210022112), we get a palindrome (22333211233322).

The spelling of 21122001211210 in words is "twenty-one trillion, one hundred twenty-two billion, one million, two hundred eleven thousand, two hundred ten".