21357528843 has 16 divisors (see below), whose sum is σ = 32549564160. Its totient is φ = 12202517856.

The previous prime is 21357528839. The next prime is 21357528869. The reversal of 21357528843 is 34882575312.

It is not a de Polignac number, because 21357528843 - 2² = 21357528839 is a prime.

It is a super-2 number, since 2×21357528843² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21357528792 and 21357528801.

It is not an unprimeable number, because it can be changed into a prime (21357528443) 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, 80173 + ... + 221681.

It is an arithmetic number, because the mean of its divisors is an integer number (2034347760).

Almost surely, 2^21357528843 is an apocalyptic number.

21357528843 is a deficient number, since it is larger than the sum of its proper divisors (11192035317).

21357528843 is a wasteful number, since it uses less digits than its factorization.

21357528843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148706.

The product of its digits is 1612800, while the sum is 48.

The spelling of 21357528843 in words is "twenty-one billion, three hundred fifty-seven million, five hundred twenty-eight thousand, eight hundred forty-three".