42216756621 has 32 divisors (see below), whose sum is σ = 64088304000. Its totient is φ = 24504622848.

The previous prime is 42216756607. The next prime is 42216756643. The reversal of 42216756621 is 12665761224.

It is not a de Polignac number, because 42216756621 - 2¹³ = 42216748429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42216756661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45295 + ... + 294083.

It is an arithmetic number, because the mean of its divisors is an integer number (2002759500).

Almost surely, 2^42216756621 is an apocalyptic number.

It is an amenable number.

42216756621 is a deficient number, since it is larger than the sum of its proper divisors (21871547379).

42216756621 is a wasteful number, since it uses less digits than its factorization.

42216756621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249053.

The product of its digits is 241920, while the sum is 42.

The spelling of 42216756621 in words is "forty-two billion, two hundred sixteen million, seven hundred fifty-six thousand, six hundred twenty-one".