7745211138021 has 24 divisors (see below), whose sum is σ = 12099404892960. Its totient is φ = 4393994385312.

The previous prime is 7745211138019. The next prime is 7745211138037. The reversal of 7745211138021 is 1208311125477.

It is not a de Polignac number, because 7745211138021 - 2¹ = 7745211138019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7745211138221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189506586 + ... + 189547451.

It is an arithmetic number, because the mean of its divisors is an integer number (504141870540).

Almost surely, 2^{7745211138021} is an apocalyptic number.

It is an amenable number.

7745211138021 is a deficient number, since it is larger than the sum of its proper divisors (4354193754939).

7745211138021 is a wasteful number, since it uses less digits than its factorization.

7745211138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379054193 (or 379054186 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 7745211138021 in words is "seven trillion, seven hundred forty-five billion, two hundred eleven million, one hundred thirty-eight thousand, twenty-one".