21629864093 has 4 divisors (see below), whose sum is σ = 21638634240. Its totient is φ = 21621093948.

The previous prime is 21629864071. The next prime is 21629864111. The reversal of 21629864093 is 39046892612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21629864093 - 2⁶ = 21629864029 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 (21629864063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4381373 + ... + 4386306.

It is an arithmetic number, because the mean of its divisors is an integer number (5409658560).

Almost surely, 2^21629864093 is an apocalyptic number.

It is an amenable number.

21629864093 is a deficient number, since it is larger than the sum of its proper divisors (8770147).

21629864093 is an equidigital number, since it uses as much as digits as its factorization.

21629864093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8770146.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 21629864093 in words is "twenty-one billion, six hundred twenty-nine million, eight hundred sixty-four thousand, ninety-three".