21275139403 has 8 divisors (see below), whose sum is σ = 25371595008. Its totient is φ = 17442971304.

The previous prime is 21275139383. The next prime is 21275139409. The reversal of 21275139403 is 30493157212.

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

It is a cyclic number.

It is not a de Polignac number, because 21275139403 - 2²⁵ = 21241584971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275139409) 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, 66071701 + ... + 66072022.

It is an arithmetic number, because the mean of its divisors is an integer number (3171449376).

Almost surely, 2^21275139403 is an apocalyptic number.

21275139403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21275139403 is a deficient number, since it is larger than the sum of its proper divisors (4096455605).

21275139403 is a wasteful number, since it uses less digits than its factorization.

21275139403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132143753.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 21275139403 in words is "twenty-one billion, two hundred seventy-five million, one hundred thirty-nine thousand, four hundred three".