21001541235 has 32 divisors (see below), whose sum is σ = 34283761920. Its totient is φ = 10974307968.

The previous prime is 21001541227. The next prime is 21001541257. The reversal of 21001541235 is 53214510012.

It is a happy number.

It is not a de Polignac number, because 21001541235 - 2³ = 21001541227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 569632 + ... + 605378.

It is an arithmetic number, because the mean of its divisors is an integer number (1071367560).

Almost surely, 2^21001541235 is an apocalyptic number.

21001541235 is a deficient number, since it is larger than the sum of its proper divisors (13282220685).

21001541235 is a wasteful number, since it uses less digits than its factorization.

21001541235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36547.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21001541235 in words is "twenty-one billion, one million, five hundred forty-one thousand, two hundred thirty-five".