216772220420 has 48 divisors (see below), whose sum is σ = 534314242560. Its totient is φ = 72313202304.

The previous prime is 216772220393. The next prime is 216772220471. The reversal of 216772220420 is 24022277612.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 20918780 + ... + 20929139.

It is an arithmetic number, because the mean of its divisors is an integer number (11131546720).

Almost surely, 2^216772220420 is an apocalyptic number.

216772220420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216772220420 is an abundant number, since it is smaller than the sum of its proper divisors (317542022140).

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

216772220420 is a wasteful number, since it uses less digits than its factorization.

216772220420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41847972 (or 41847970 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 35.

The spelling of 216772220420 in words is "two hundred sixteen billion, seven hundred seventy-two million, two hundred twenty thousand, four hundred twenty".