21216465356 has 6 divisors (see below), whose sum is σ = 37128814380. Its totient is φ = 10608232676.

The previous prime is 21216465331. The next prime is 21216465377. The reversal of 21216465356 is 65356461212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652058166 + ... + 2652058173.

It is an arithmetic number, because the mean of its divisors is an integer number (6188135730).

Almost surely, 2^21216465356 is an apocalyptic number.

It is an amenable number.

21216465356 is a deficient number, since it is larger than the sum of its proper divisors (15912349024).

21216465356 is a wasteful number, since it uses less digits than its factorization.

21216465356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304116343 (or 5304116341 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The spelling of 21216465356 in words is "twenty-one billion, two hundred sixteen million, four hundred sixty-five thousand, three hundred fifty-six".