21073654028 has 36 divisors (see below), whose sum is σ = 43227471672. Its totient is φ = 8962611840.

The previous prime is 21073654027. The next prime is 21073654033. The reversal of 21073654028 is 82045637012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21073653982 and 21073654000.

It is not an unprimeable number, because it can be changed into a prime (21073654027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384701 + ... + 436052.

It is an arithmetic number, because the mean of its divisors is an integer number (1200763102).

Almost surely, 2^21073654028 is an apocalyptic number.

21073654028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21073654028 is an abundant number, since it is smaller than the sum of its proper divisors (22153817644).

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

21073654028 is a wasteful number, since it uses less digits than its factorization.

21073654028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820902 (or 820893 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 21073654028 in words is "twenty-one billion, seventy-three million, six hundred fifty-four thousand, twenty-eight".