21367535028 has 48 divisors (see below), whose sum is σ = 56996575104. Its totient is φ = 6103244160.

The previous prime is 21367535027. The next prime is 21367535087. The reversal of 21367535028 is 82053576312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367535027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270538 + ... + 340478.

It is an arithmetic number, because the mean of its divisors is an integer number (1187428648).

Almost surely, 2^21367535028 is an apocalyptic number.

21367535028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21367535028 is an abundant number, since it is smaller than the sum of its proper divisors (35629040076).

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

21367535028 is a wasteful number, since it uses less digits than its factorization.

21367535028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73592 (or 73590 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 21367535028 in words is "twenty-one billion, three hundred sixty-seven million, five hundred thirty-five thousand, twenty-eight".