21113355301531 has 4 divisors (see below), whose sum is σ = 21428480007592. Its totient is φ = 20798230595472.

The previous prime is 21113355301529. The next prime is 21113355301547. The reversal of 21113355301531 is 13510355331112.

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 21113355301531 - 2¹ = 21113355301529 is a prime.

It is a super-2 number, since 2×21113355301531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113355361531) 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, 157562352930 + ... + 157562353063.

It is an arithmetic number, because the mean of its divisors is an integer number (5357120001898).

Almost surely, 2^{21113355301531} is an apocalyptic number.

21113355301531 is a deficient number, since it is larger than the sum of its proper divisors (315124706061).

21113355301531 is an equidigital number, since it uses as much as digits as its factorization.

21113355301531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315124706060.

The product of its (nonzero) digits is 20250, while the sum is 34.

The spelling of 21113355301531 in words is "twenty-one trillion, one hundred thirteen billion, three hundred fifty-five million, three hundred one thousand, five hundred thirty-one".