21500235202731 has 8 divisors (see below), whose sum is σ = 28672602369600. Its totient is φ = 14330679085512.

The previous prime is 21500235202717. The next prime is 21500235202763. The reversal of 21500235202731 is 13720253200512.

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

It is not a de Polignac number, because 21500235202731 - 2¹¹ = 21500235200683 is a prime.

It is a super-2 number, since 2×21500235202731² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21500235202692 and 21500235202701.

It is not an unprimeable number, because it can be changed into a prime (21500235202231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702744565 + ... + 702775158.

It is an arithmetic number, because the mean of its divisors is an integer number (3584075296200).

Almost surely, 2^{21500235202731} is an apocalyptic number.

21500235202731 is a deficient number, since it is larger than the sum of its proper divisors (7172367166869).

21500235202731 is a wasteful number, since it uses less digits than its factorization.

21500235202731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405524825.

The product of its (nonzero) digits is 25200, while the sum is 33.

The spelling of 21500235202731 in words is "twenty-one trillion, five hundred billion, two hundred thirty-five million, two hundred two thousand, seven hundred thirty-one".