21121110021011 has 32 divisors (see below), whose sum is σ = 28361633664000. Its totient is φ = 15190282097280.

The previous prime is 21121110020971. The next prime is 21121110021031. The reversal of 21121110021011 is 11012001112112.

It is a cyclic number.

It is not a de Polignac number, because 21121110021011 - 2³⁴ = 21103930151827 is a prime.

It is a super-2 number, since 2×21121110021011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121110021031) 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, 7654265 + ... + 10041413.

It is an arithmetic number, because the mean of its divisors is an integer number (886301052000).

Almost surely, 2^{21121110021011} is an apocalyptic number.

21121110021011 is a deficient number, since it is larger than the sum of its proper divisors (7240523642989).

21121110021011 is a wasteful number, since it uses less digits than its factorization.

21121110021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396019.

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

Adding to 21121110021011 its reverse (11012001112112), we get a palindrome (32133111133123).

The spelling of 21121110021011 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, twenty-one thousand, eleven".