21135013004 has 36 divisors (see below), whose sum is σ = 43468442136. Its totient is φ = 8964474624.

The previous prime is 21135012991. The next prime is 21135013021. The reversal of 21135013004 is 40031053112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 536822 + ... + 574845.

It is an arithmetic number, because the mean of its divisors is an integer number (1207456726).

Almost surely, 2^21135013004 is an apocalyptic number.

It is an amenable number.

21135013004 is an abundant number, since it is smaller than the sum of its proper divisors (22333429132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21135013004 is a wasteful number, since it uses less digits than its factorization.

21135013004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111782 (or 1111773 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21135013004 its reverse (40031053112), we get a palindrome (61166066116).

The spelling of 21135013004 in words is "twenty-one billion, one hundred thirty-five million, thirteen thousand, four".