21120402134 has 16 divisors (see below), whose sum is σ = 34123336800. Its totient is φ = 9746231040.

The previous prime is 21120402131. The next prime is 21120402137. The reversal of 21120402134 is 43120402112.

It is an interprime number because it is at equal distance from previous prime (21120402131) and next prime (21120402137).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120402131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95654 + ... + 226694.

It is an arithmetic number, because the mean of its divisors is an integer number (2132708550).

Almost surely, 2^21120402134 is an apocalyptic number.

21120402134 is a deficient number, since it is larger than the sum of its proper divisors (13002934666).

21120402134 is a wasteful number, since it uses less digits than its factorization.

21120402134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137255.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21120402134 its reverse (43120402112), we get a palindrome (64240804246).

The spelling of 21120402134 in words is "twenty-one billion, one hundred twenty million, four hundred two thousand, one hundred thirty-four".