21051534235 has 16 divisors (see below), whose sum is σ = 25729228800. Its totient is φ = 16530507616.

The previous prime is 21051534223. The next prime is 21051534241. The reversal of 21051534235 is 53243515012.

It is a cyclic number.

It is not a de Polignac number, because 21051534235 - 2³¹ = 18904050587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21051534197 and 21051534206.

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, 140262 + ... + 248548.

It is an arithmetic number, because the mean of its divisors is an integer number (1608076800).

Almost surely, 2^21051534235 is an apocalyptic number.

21051534235 is a deficient number, since it is larger than the sum of its proper divisors (4677694565).

21051534235 is a wasteful number, since it uses less digits than its factorization.

21051534235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109010.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21051534235 in words is "twenty-one billion, fifty-one million, five hundred thirty-four thousand, two hundred thirty-five".