221111992020 has 24 divisors (see below), whose sum is σ = 619113577824. Its totient is φ = 58963197856.

The previous prime is 221111992019. The next prime is 221111992027. The reversal of 221111992020 is 20299111122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111992027) 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 7 ways as a sum of consecutive naturals, for example, 1842599874 + ... + 1842599993.

It is an arithmetic number, because the mean of its divisors is an integer number (25796399076).

Almost surely, 2^221111992020 is an apocalyptic number.

221111992020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111992020 is an abundant number, since it is smaller than the sum of its proper divisors (398001585804).

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

221111992020 is a wasteful number, since it uses less digits than its factorization.

221111992020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685199879 (or 3685199877 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 221111992020 in words is "two hundred twenty-one billion, one hundred eleven million, nine hundred ninety-two thousand, twenty".