70028003128921 has 2 divisors, whose sum is σ = 70028003128922. Its totient is φ = 70028003128920.

The previous prime is 70028003128793. The next prime is 70028003128949. The reversal of 70028003128921 is 12982130082007.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57001216507225 + 13026786621696 = 7549915^2 + 3609264^2 .

It is a cyclic number.

It is not a de Polignac number, because 70028003128921 - 2⁷ = 70028003128793 is a prime.

It is a super-2 number, since 2×70028003128921² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70028003128121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35014001564460 + 35014001564461.

It is an arithmetic number, because the mean of its divisors is an integer number (35014001564461).

Almost surely, 2^{70028003128921} is an apocalyptic number.

It is an amenable number.

70028003128921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70028003128921 is an equidigital number, since it uses as much as digits as its factorization.

70028003128921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 70028003128921 in words is "seventy trillion, twenty-eight billion, three million, one hundred twenty-eight thousand, nine hundred twenty-one".