21000032123013 has 8 divisors (see below), whose sum is σ = 31111158700800. Its totient is φ = 14000021415324.

The previous prime is 21000032123003. The next prime is 21000032123027. The reversal of 21000032123013 is 31032123000012.

21000032123013 is a `hidden beast` number, since 2 + 100 + 0 + 0 + 321 + 230 + 13 = 666.

It is not a de Polignac number, because 21000032123013 - 2⁴ = 21000032122997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000032123003) 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, 388889483733 + ... + 388889483786.

It is an arithmetic number, because the mean of its divisors is an integer number (3888894837600).

Almost surely, 2^{21000032123013} is an apocalyptic number.

It is an amenable number.

21000032123013 is a deficient number, since it is larger than the sum of its proper divisors (10111126577787).

21000032123013 is an equidigital number, since it uses as much as digits as its factorization.

21000032123013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777778967528 (or 777778967522 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21000032123013 its reverse (31032123000012), we get a palindrome (52032155123025).

The spelling of 21000032123013 in words is "twenty-one trillion, thirty-two million, one hundred twenty-three thousand, thirteen".