221390293780 has 48 divisors (see below), whose sum is σ = 479967828480. Its totient is φ = 85690396800.

The previous prime is 221390293757. The next prime is 221390293829. The reversal of 221390293780 is 87392093122.

It is a self number, because there is not a number n which added to its sum of digits gives 221390293780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11485791 + ... + 11505049.

It is an arithmetic number, because the mean of its divisors is an integer number (9999329760).

Almost surely, 2^221390293780 is an apocalyptic number.

221390293780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221390293780 is an abundant number, since it is smaller than the sum of its proper divisors (258577534700).

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

221390293780 is a wasteful number, since it uses less digits than its factorization.

221390293780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37840 (or 37838 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 221390293780 in words is "two hundred twenty-one billion, three hundred ninety million, two hundred ninety-three thousand, seven hundred eighty".