21150121465452 has 36 divisors (see below), whose sum is σ = 57407472550680. Its totient is φ = 6042891847104.

The previous prime is 21150121465393. The next prime is 21150121465457. The reversal of 21150121465452 is 25456412105112.

It is a self number, because there is not a number n which added to its sum of digits gives 21150121465452.

It is not an unprimeable number, because it can be changed into a prime (21150121465457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17984796577 + ... + 17984797752.

Almost surely, 2^{21150121465452} is an apocalyptic number.

It is an amenable number.

21150121465452 is an abundant number, since it is smaller than the sum of its proper divisors (36257351085228).

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

21150121465452 is a wasteful number, since it uses less digits than its factorization.

21150121465452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35969594350 (or 35969594341 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The spelling of 21150121465452 in words is "twenty-one trillion, one hundred fifty billion, one hundred twenty-one million, four hundred sixty-five thousand, four hundred fifty-two".