21000134893238 has 32 divisors (see below), whose sum is σ = 31746799812000. Its totient is φ = 10418201254656.

The previous prime is 21000134893237. The next prime is 21000134893277. The reversal of 21000134893238 is 83239843100012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000134893237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652101245 + ... + 652133447.

It is an arithmetic number, because the mean of its divisors is an integer number (992087494125).

Almost surely, 2^{21000134893238} is an apocalyptic number.

21000134893238 is a deficient number, since it is larger than the sum of its proper divisors (10746664918762).

21000134893238 is a wasteful number, since it uses less digits than its factorization.

21000134893238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37296.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 21000134893238 in words is "twenty-one trillion, one hundred thirty-four million, eight hundred ninety-three thousand, two hundred thirty-eight".