7021498335721 has 3 divisors (see below), whose sum is σ = 7021500985533. Its totient is φ = 7021495685910.

The previous prime is 7021498335713. The next prime is 7021498335727. The reversal of 7021498335721 is 1275338941207.

The square root of 7021498335721 is 2649811.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 7021498335721 - 2³ = 7021498335713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7021498335727) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1324906 + ... + 3974716.

It is an arithmetic number, because the mean of its divisors is an integer number (2340500328511).

Almost surely, 2^{7021498335721} is an apocalyptic number.

7021498335721 is the 2649811-st square number.

7021498335721 is the 1324906-th centered octagonal number.

It is an amenable number.

7021498335721 is a deficient number, since it is larger than the sum of its proper divisors (2649812).

7021498335721 is an frugal number, since it uses more digits than its factorization.

7021498335721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299622 (or 2649811 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 7021498335721 in words is "seven trillion, twenty-one billion, four hundred ninety-eight million, three hundred thirty-five thousand, seven hundred twenty-one".