21123340362252 has 72 divisors (see below), whose sum is σ = 56261085207600. Its totient is φ = 6663917288448.

The previous prime is 21123340362251. The next prime is 21123340362323. The reversal of 21123340362252 is 25226304332112.

21123340362252 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 3 + 3 + 40 + 362 + 252 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21123340362251) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 14613153 + ... + 15993464.

Almost surely, 2^{21123340362252} is an apocalyptic number.

It is an amenable number.

21123340362252 is an abundant number, since it is smaller than the sum of its proper divisors (35137744845348).

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

21123340362252 is a wasteful number, since it uses less digits than its factorization.

21123340362252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30607655 (or 30607650 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 21123340362252 its reverse (25226304332112), we get a palindrome (46349644694364).

The spelling of 21123340362252 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred forty million, three hundred sixty-two thousand, two hundred fifty-two".