21379465801 has 4 divisors (see below), whose sum is σ = 21379883652. Its totient is φ = 21379047952.

The previous prime is 21379465781. The next prime is 21379465843. The reversal of 21379465801 is 10856497312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8085606400 + 13293859401 = 89920^2 + 115299^2 .

It is a cyclic number.

It is not a de Polignac number, because 21379465801 - 2⁵ = 21379465769 is a prime.

It is a super-2 number, since 2×21379465801² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21379465001) 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, 119386 + ... + 238771.

It is an arithmetic number, because the mean of its divisors is an integer number (5344970913).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21379465801 = 42758931602, but 3⋅21379465801 = 64138397403 is not.

Almost surely, 2^21379465801 is an apocalyptic number.

21379465801 is the 119386-th pentagonal number.

It is an amenable number.

21379465801 is a deficient number, since it is larger than the sum of its proper divisors (417851).

21379465801 is an equidigital number, since it uses as much as digits as its factorization.

21379465801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417850.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 21379465801 in words is "twenty-one billion, three hundred seventy-nine million, four hundred sixty-five thousand, eight hundred one".