21213300039 has 16 divisors (see below), whose sum is σ = 29517523200. Its totient is φ = 13525778816.

The previous prime is 21213300013. The next prime is 21213300079. The reversal of 21213300039 is 93000331212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213300039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213299991 and 21213300018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213300079) 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, 1197952 + ... + 1215530.

It is an arithmetic number, because the mean of its divisors is an integer number (1844845200).

Almost surely, 2^21213300039 is an apocalyptic number.

21213300039 is a deficient number, since it is larger than the sum of its proper divisors (8304223161).

21213300039 is a wasteful number, since it uses less digits than its factorization.

21213300039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35094.

The product of its (nonzero) digits is 972, while the sum is 24.

The spelling of 21213300039 in words is "twenty-one billion, two hundred thirteen million, three hundred thousand, thirty-nine".