21221010121011 has 32 divisors (see below), whose sum is σ = 30498934026240. Its totient is φ = 13086418329600.

The previous prime is 21221010121007. The next prime is 21221010121019. The reversal of 21221010121011 is 11012101012212.

It is a happy number.

It is not a de Polignac number, because 21221010121011 - 2² = 21221010121007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221010121019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 506730 + ... + 6534431.

It is an arithmetic number, because the mean of its divisors is an integer number (953091688320).

Almost surely, 2^{21221010121011} is an apocalyptic number.

21221010121011 is a deficient number, since it is larger than the sum of its proper divisors (9277923905229).

21221010121011 is a wasteful number, since it uses less digits than its factorization.

21221010121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042627.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221010121011 its reverse (11012101012212), we get a palindrome (32233111133223).

The spelling of 21221010121011 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, one hundred twenty-one thousand, eleven".