21420219496 has 32 divisors (see below), whose sum is σ = 43265305440. Its totient is φ = 9883297728.

The previous prime is 21420219467. The next prime is 21420219503. The reversal of 21420219496 is 69491202412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339855 + ... + 397921.

It is an arithmetic number, because the mean of its divisors is an integer number (1352040795).

Almost surely, 2^21420219496 is an apocalyptic number.

21420219496 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21420219496 is an abundant number, since it is smaller than the sum of its proper divisors (21845085944).

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

21420219496 is a wasteful number, since it uses less digits than its factorization.

21420219496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61633 (or 61629 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21420219496 in words is "twenty-one billion, four hundred twenty million, two hundred nineteen thousand, four hundred ninety-six".