21375148031 has 4 divisors (see below), whose sum is σ = 21667958352. Its totient is φ = 21082337712.

The previous prime is 21375148021. The next prime is 21375148057. The reversal of 21375148031 is 13084157312.

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

It is a cyclic number.

It is not a de Polignac number, because 21375148031 - 2¹⁰ = 21375147007 is a prime.

It is a super-2 number, since 2×21375148031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21375147982 and 21375148000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375148021) 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, 146405051 + ... + 146405196.

It is an arithmetic number, because the mean of its divisors is an integer number (5416989588).

Almost surely, 2^21375148031 is an apocalyptic number.

21375148031 is a deficient number, since it is larger than the sum of its proper divisors (292810321).

21375148031 is an equidigital number, since it uses as much as digits as its factorization.

21375148031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292810320.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21375148031 in words is "twenty-one billion, three hundred seventy-five million, one hundred forty-eight thousand, thirty-one".