21055454252 has 30 divisors (see below), whose sum is σ = 42985680948. Its totient is φ = 9023761992.

The previous prime is 21055454243. The next prime is 21055454267. The reversal of 21055454252 is 25245455012.

It is a super-3 number, since 3×21055454252³ (a number of 32 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1086578 + ... + 1105785.

Almost surely, 2^21055454252 is an apocalyptic number.

It is an amenable number.

21055454252 is an abundant number, since it is smaller than the sum of its proper divisors (21930226696).

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

21055454252 is an equidigital number, since it uses as much as digits as its factorization.

21055454252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192395 (or 2192372 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 21055454252 in words is "twenty-one billion, fifty-five million, four hundred fifty-four thousand, two hundred fifty-two".