21367545452 has 12 divisors (see below), whose sum is σ = 40792586856. Its totient is φ = 9712520640.

The previous prime is 21367545431. The next prime is 21367545517. The reversal of 21367545452 is 25454576312.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 485626033 = 21367545452 / (2 + 1 + 3 + 6 + 7 + 5 + 4 + 5 + 4 + 5 + 2).

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, 242812973 + ... + 242813060.

It is an arithmetic number, because the mean of its divisors is an integer number (3399382238).

Almost surely, 2^21367545452 is an apocalyptic number.

21367545452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21367545452 is a deficient number, since it is larger than the sum of its proper divisors (19425041404).

21367545452 is a wasteful number, since it uses less digits than its factorization.

21367545452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485626048 (or 485626046 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 44.

The spelling of 21367545452 in words is "twenty-one billion, three hundred sixty-seven million, five hundred forty-five thousand, four hundred fifty-two".