21153164312252 has 12 divisors (see below), whose sum is σ = 42306328624560. Its totient is φ = 9065641848096.

The previous prime is 21153164312249. The next prime is 21153164312257. The reversal of 21153164312252 is 25221346135112.

21153164312252 is an admirable number.

It is a super-2 number, since 2×21153164312252² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153164312257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377735076977 + ... + 377735077032.

It is an arithmetic number, because the mean of its divisors is an integer number (3525527385380).

Almost surely, 2^{21153164312252} is an apocalyptic number.

It is an amenable number.

21153164312252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21153164312252 is a wasteful number, since it uses less digits than its factorization.

21153164312252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755470154020 (or 755470154018 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The spelling of 21153164312252 in words is "twenty-one trillion, one hundred fifty-three billion, one hundred sixty-four million, three hundred twelve thousand, two hundred fifty-two".