21151342079 has 4 divisors (see below), whose sum is σ = 24172962384. Its totient is φ = 18129721776.

The previous prime is 21151342061. The next prime is 21151342097. The reversal of 21151342079 is 97024315112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21151342061) and next prime (21151342097).

It is a cyclic number.

It is not a de Polignac number, because 21151342079 - 2¹⁶ = 21151276543 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 (21151342019) 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, 1510810142 + ... + 1510810155.

It is an arithmetic number, because the mean of its divisors is an integer number (6043240596).

Almost surely, 2^21151342079 is an apocalyptic number.

21151342079 is a deficient number, since it is larger than the sum of its proper divisors (3021620305).

21151342079 is an equidigital number, since it uses as much as digits as its factorization.

21151342079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021620304.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 21151342079 in words is "twenty-one billion, one hundred fifty-one million, three hundred forty-two thousand, seventy-nine".