61975207021 has 16 divisors (see below), whose sum is σ = 80764072704. Its totient is φ = 46150896384.

The previous prime is 61975207009. The next prime is 61975207027. The reversal of 61975207021 is 12070257916.

61975207021 is digitally balanced in base 2, 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 61975207021 - 2²³ = 61966818413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61975207027) 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, 20029225 + ... + 20032318.

It is an arithmetic number, because the mean of its divisors is an integer number (5047754544).

Almost surely, 2^61975207021 is an apocalyptic number.

It is an amenable number.

61975207021 is a deficient number, since it is larger than the sum of its proper divisors (18788865683).

61975207021 is a wasteful number, since it uses less digits than its factorization.

61975207021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40061580.

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 61975207021 in words is "sixty-one billion, nine hundred seventy-five million, two hundred seven thousand, twenty-one".