21012031103011 has 64 divisors (see below), whose sum is σ = 23491271091456. Its totient is φ = 18676085760000.

The previous prime is 21012031102957. The next prime is 21012031103029. The reversal of 21012031103011 is 11030113021012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21012031103011 - 2⁷ = 21012031102883 is a prime.

It is a super-2 number, since 2×21012031103011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012031803011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1982822965 + ... + 1982833561.

It is an arithmetic number, because the mean of its divisors is an integer number (367051110804).

Almost surely, 2^{21012031103011} is an apocalyptic number.

21012031103011 is a deficient number, since it is larger than the sum of its proper divisors (2479239988445).

21012031103011 is a wasteful number, since it uses less digits than its factorization.

21012031103011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11072.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21012031103011 its reverse (11030113021012), we get a palindrome (32042144124023).

The spelling of 21012031103011 in words is "twenty-one trillion, twelve billion, thirty-one million, one hundred three thousand, eleven".