7138497021 has 16 divisors (see below), whose sum is σ = 9571915584. Its totient is φ = 4732104704.

The previous prime is 7138497017. The next prime is 7138497031. The reversal of 7138497021 is 1207948317.

7138497021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7138497021 - 2² = 7138497017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138497031) 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, 444691 + ... + 460463.

It is an arithmetic number, because the mean of its divisors is an integer number (598244724).

Almost surely, 2^7138497021 is an apocalyptic number.

It is an amenable number.

7138497021 is a deficient number, since it is larger than the sum of its proper divisors (2433418563).

7138497021 is a wasteful number, since it uses less digits than its factorization.

7138497021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16620.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 7138497021 is about 84489.6267064780. The cubic root of 7138497021 is about 1925.4648471824.

The spelling of 7138497021 in words is "seven billion, one hundred thirty-eight million, four hundred ninety-seven thousand, twenty-one".