21231512035 has 16 divisors (see below), whose sum is σ = 26595198720. Its totient is φ = 16252600320.

The previous prime is 21231512023. The next prime is 21231512069. The reversal of 21231512035 is 53021513212.

It is not a de Polignac number, because 21231512035 - 2¹⁵ = 21231479267 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 755742 + ... + 783331.

It is an arithmetic number, because the mean of its divisors is an integer number (1662199920).

Almost surely, 2^21231512035 is an apocalyptic number.

21231512035 is a deficient number, since it is larger than the sum of its proper divisors (5363686685).

21231512035 is a wasteful number, since it uses less digits than its factorization.

21231512035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539198.

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 21231512035 in words is "twenty-one billion, two hundred thirty-one million, five hundred twelve thousand, thirty-five".