21121024134 has 48 divisors (see below), whose sum is σ = 48708870912. Its totient is φ = 5981023104.

The previous prime is 21121024087. The next prime is 21121024157. The reversal of 21121024134 is 43142012112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121024134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516607 + ... + 555989.

It is an arithmetic number, because the mean of its divisors is an integer number (1014768144).

Almost surely, 2^21121024134 is an apocalyptic number.

21121024134 is an abundant number, since it is smaller than the sum of its proper divisors (27587846778).

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

21121024134 is a wasteful number, since it uses less digits than its factorization.

21121024134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39621 (or 39508 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21121024134 its reverse (43142012112), we get a palindrome (64263036246).

The spelling of 21121024134 in words is "twenty-one billion, one hundred twenty-one million, twenty-four thousand, one hundred thirty-four".