1370021565421 has 2 divisors, whose sum is σ = 1370021565422. Its totient is φ = 1370021565420.

The previous prime is 1370021565397. The next prime is 1370021565461. The reversal of 1370021565421 is 1245651200731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1336682822500 + 33338742921 = 1156150^2 + 182589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1370021565421 - 2⁷ = 1370021565293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1370021565461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685010782710 + 685010782711.

It is an arithmetic number, because the mean of its divisors is an integer number (685010782711).

Almost surely, 2^{1370021565421} is an apocalyptic number.

It is an amenable number.

1370021565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1370021565421 is an equidigital number, since it uses as much as digits as its factorization.

1370021565421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 1370021565421 in words is "one trillion, three hundred seventy billion, twenty-one million, five hundred sixty-five thousand, four hundred twenty-one".