39742774620221 has 4 divisors (see below), whose sum is σ = 39742944123744. Its totient is φ = 39742605116700.

The previous prime is 39742774620217. The next prime is 39742774620229. The reversal of 39742774620221 is 12202647724793.

39742774620221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39742774620221 - 2² = 39742774620217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39742774620229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84399575 + ... + 84869156.

It is an arithmetic number, because the mean of its divisors is an integer number (9935736030936).

Almost surely, 2^{39742774620221} is an apocalyptic number.

It is an amenable number.

39742774620221 is a deficient number, since it is larger than the sum of its proper divisors (169503523).

39742774620221 is a wasteful number, since it uses less digits than its factorization.

39742774620221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169503522.

The product of its (nonzero) digits is 14224896, while the sum is 56.

The spelling of 39742774620221 in words is "thirty-nine trillion, seven hundred forty-two billion, seven hundred seventy-four million, six hundred twenty thousand, two hundred twenty-one".