21123010233012 has 48 divisors (see below), whose sum is σ = 49485681463680. Its totient is φ = 7012674576768.

The previous prime is 21123010232971. The next prime is 21123010233041. The reversal of 21123010233012 is 21033201032112.

It is a super-2 number, since 2×21123010233012² (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 21123010233012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149914 + ... + 6501422.

It is an arithmetic number, because the mean of its divisors is an integer number (1030951697160).

Almost surely, 2^{21123010233012} is an apocalyptic number.

It is an amenable number.

21123010233012 is an abundant number, since it is smaller than the sum of its proper divisors (28362671230668).

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

21123010233012 is a wasteful number, since it uses less digits than its factorization.

21123010233012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6352632 (or 6352630 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21123010233012 its reverse (21033201032112), we get a palindrome (42156211265124).

The spelling of 21123010233012 in words is "twenty-one trillion, one hundred twenty-three billion, ten million, two hundred thirty-three thousand, twelve".