21035505252 has 12 divisors (see below), whose sum is σ = 49082845616. Its totient is φ = 7011835080.

The previous prime is 21035505247. The next prime is 21035505269. The reversal of 21035505252 is 25250553012.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876479374 + ... + 876479397.

Almost surely, 2^21035505252 is an apocalyptic number.

It is an amenable number.

21035505252 is an abundant number, since it is smaller than the sum of its proper divisors (28047340364).

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

21035505252 is a wasteful number, since it uses less digits than its factorization.

21035505252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752958778 (or 1752958776 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 21035505252 in words is "twenty-one billion, thirty-five million, five hundred five thousand, two hundred fifty-two".