21012111022012 has 24 divisors (see below), whose sum is σ = 41092421115312. Its totient is φ = 9318009321600.

The previous prime is 21012111021953. The next prime is 21012111022027. The reversal of 21012111022012 is 21022011121012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5823754023 + ... + 5823757630.

It is an arithmetic number, because the mean of its divisors is an integer number (1712184213138).

Almost surely, 2^{21012111022012} is an apocalyptic number.

21012111022012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012111022012 is a deficient number, since it is larger than the sum of its proper divisors (20080310093300).

21012111022012 is a wasteful number, since it uses less digits than its factorization.

21012111022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11647511709 (or 11647511707 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012111022012 its reverse (21022011121012), we get a palindrome (42034122143024).

The spelling of 21012111022012 in words is "twenty-one trillion, twelve billion, one hundred eleven million, twenty-two thousand, twelve".