21106031151 has 8 divisors (see below), whose sum is σ = 28199161984. Its totient is φ = 14041793880.

The previous prime is 21106031143. The next prime is 21106031179. The reversal of 21106031151 is 15113060112.

It is a happy number.

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

It is not a de Polignac number, because 21106031151 - 2³ = 21106031143 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 (21106031251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7221685 + ... + 7224606.

It is an arithmetic number, because the mean of its divisors is an integer number (3524895248).

Almost surely, 2^21106031151 is an apocalyptic number.

21106031151 is a deficient number, since it is larger than the sum of its proper divisors (7093130833).

21106031151 is a wasteful number, since it uses less digits than its factorization.

21106031151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14446781.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 21106031151 its reverse (15113060112), we get a palindrome (36219091263).

The spelling of 21106031151 in words is "twenty-one billion, one hundred six million, thirty-one thousand, one hundred fifty-one".