21012011335 has 64 divisors (see below), whose sum is σ = 30351283200. Its totient is φ = 13661125632.

The previous prime is 21012011299. The next prime is 21012011347. The reversal of 21012011335 is 53311021012.

It is not a de Polignac number, because 21012011335 - 2⁹ = 21012010823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14723892 + ... + 14725318.

It is an arithmetic number, because the mean of its divisors is an integer number (474238800).

Almost surely, 2^21012011335 is an apocalyptic number.

21012011335 is a deficient number, since it is larger than the sum of its proper divisors (9339271865).

21012011335 is a wasteful number, since it uses less digits than its factorization.

21012011335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 21012011335 its reverse (53311021012), we get a palindrome (74323032347).

The spelling of 21012011335 in words is "twenty-one billion, twelve million, eleven thousand, three hundred thirty-five".