21012010111120 has 60 divisors (see below), whose sum is σ = 56828911030524. Its totient is φ = 7204117751040.

The previous prime is 21012010111117. The next prime is 21012010111123. The reversal of 21012010111120 is 2111101021012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21012010111117) and next prime (21012010111123).

It can be written as a sum of positive squares in 2 ways, for example, as 12786517278976 + 8225492832144 = 3575824^2 + 2868012^2 .

It is a super-2 number, since 2×21012010111120² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21012010111120.

It is not an unprimeable number, because it can be changed into a prime (21012010111123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2680099411 + ... + 2680107250.

Almost surely, 2^{21012010111120} is an apocalyptic number.

21012010111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012010111120 is an abundant number, since it is smaller than the sum of its proper divisors (35816900919404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012010111120 is a wasteful number, since it uses less digits than its factorization.

21012010111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360206688 (or 5360206675 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21012010111120 its reverse (2111101021012), we get a palindrome (23123111132132).

The spelling of 21012010111120 in words is "twenty-one trillion, twelve billion, ten million, one hundred eleven thousand, one hundred twenty".