221508924990 has 16 divisors (see below), whose sum is σ = 531621420048. Its totient is φ = 59069046656.

The previous prime is 221508924947. The next prime is 221508924991. The reversal of 221508924990 is 99429805122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221508924991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691815387 + ... + 3691815446.

It is an arithmetic number, because the mean of its divisors is an integer number (33226338753).

Almost surely, 2^221508924990 is an apocalyptic number.

221508924990 is an abundant number, since it is smaller than the sum of its proper divisors (310112495058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221508924990 is a wasteful number, since it uses less digits than its factorization.

221508924990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7383630843.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 221508924990 in words is "two hundred twenty-one billion, five hundred eight million, nine hundred twenty-four thousand, nine hundred ninety".