21213711967 has 8 divisors (see below), whose sum is σ = 24265097856. Its totient is φ = 18167539992.

The previous prime is 21213711947. The next prime is 21213711971. The reversal of 21213711967 is 76911731212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21213711967 - 2⁷ = 21213711839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213711947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1294753 + ... + 1311034.

It is an arithmetic number, because the mean of its divisors is an integer number (3033137232).

Almost surely, 2^21213711967 is an apocalyptic number.

21213711967 is a deficient number, since it is larger than the sum of its proper divisors (3051385889).

21213711967 is a wasteful number, since it uses less digits than its factorization.

21213711967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606957.

The product of its digits is 31752, while the sum is 40.

The spelling of 21213711967 in words is "twenty-one billion, two hundred thirteen million, seven hundred eleven thousand, nine hundred sixty-seven".