2000015000021 has 2 divisors, whose sum is σ = 2000015000022. Its totient is φ = 2000015000020.

The previous prime is 2000015000017. The next prime is 2000015000023. The reversal of 2000015000021 is 1200005100002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1425125013796 + 574889986225 = 1193786^2 + 758215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000015000021 - 2² = 2000015000017 is a prime.

Together with 2000015000023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2000014999966 and 2000015000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000015000023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000007500010 + 1000007500011.

It is an arithmetic number, because the mean of its divisors is an integer number (1000007500011).

Almost surely, 2^{2000015000021} is an apocalyptic number.

It is an amenable number.

2000015000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000015000021 is an equidigital number, since it uses as much as digits as its factorization.

2000015000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 11.

The spelling of 2000015000021 in words is "two trillion, fifteen million, twenty-one", and thus it is an aban number and an uban number.