21945023853 has 16 divisors (see below), whose sum is σ = 29712836736. Its totient is φ = 14404178880.

The previous prime is 21945023851. The next prime is 21945023857. The reversal of 21945023853 is 35832054912.

It is not a de Polignac number, because 21945023853 - 2¹ = 21945023851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945023851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85851 + ... + 226407.

It is an arithmetic number, because the mean of its divisors is an integer number (1857052296).

Almost surely, 2^21945023853 is an apocalyptic number.

It is an amenable number.

21945023853 is a deficient number, since it is larger than the sum of its proper divisors (7767812883).

21945023853 is a wasteful number, since it uses less digits than its factorization.

21945023853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141364.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 21945023853 in words is "twenty-one billion, nine hundred forty-five million, twenty-three thousand, eight hundred fifty-three".