21206465452 has 12 divisors (see below), whose sum is σ = 37634009616. Its totient is φ = 10453891280.

The previous prime is 21206465443. The next prime is 21206465453. The reversal of 21206465452 is 25456460212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21206465453) 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, 37335043 + ... + 37335610.

It is an arithmetic number, because the mean of its divisors is an integer number (3136167468).

Almost surely, 2^21206465452 is an apocalyptic number.

It is an amenable number.

21206465452 is a deficient number, since it is larger than the sum of its proper divisors (16427544164).

21206465452 is a wasteful number, since it uses less digits than its factorization.

21206465452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74670728 (or 74670726 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 21206465452 in words is "twenty-one billion, two hundred six million, four hundred sixty-five thousand, four hundred fifty-two".