21121010211011 has 16 divisors (see below), whose sum is σ = 22751796672000. Its totient is φ = 19542225755808.

The previous prime is 21121010210959. The next prime is 21121010211127. The reversal of 21121010211011 is 11011201012112.

It is a cyclic number.

It is not a de Polignac number, because 21121010211011 - 2³⁰ = 21119936469187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121010211911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7625825 + ... + 10019741.

It is an arithmetic number, because the mean of its divisors is an integer number (1421987292000).

Almost surely, 2^{21121010211011} is an apocalyptic number.

21121010211011 is a deficient number, since it is larger than the sum of its proper divisors (1630786460989).

21121010211011 is a wasteful number, since it uses less digits than its factorization.

21121010211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404778.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21121010211011 its reverse (11011201012112), we get a palindrome (32132211223123).

The spelling of 21121010211011 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, two hundred eleven thousand, eleven".