7157171456421 has 16 divisors (see below), whose sum is σ = 10906265046528. Its totient is φ = 4089775129200.

The previous prime is 7157171456419. The next prime is 7157171456423. The reversal of 7157171456421 is 1246541717517.

It is an interprime number because it is at equal distance from previous prime (7157171456419) and next prime (7157171456423).

It is not a de Polignac number, because 7157171456421 - 2¹ = 7157171456419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7157171456423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911826 + ... + 3891756.

It is an arithmetic number, because the mean of its divisors is an integer number (681641565408).

Almost surely, 2^{7157171456421} is an apocalyptic number.

It is an amenable number.

7157171456421 is a deficient number, since it is larger than the sum of its proper divisors (3749093590107).

7157171456421 is a wasteful number, since it uses less digits than its factorization.

7157171456421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094312.

The product of its digits is 1646400, while the sum is 51.

The spelling of 7157171456421 in words is "seven trillion, one hundred fifty-seven billion, one hundred seventy-one million, four hundred fifty-six thousand, four hundred twenty-one".