221912979043 has 6 divisors (see below), whose sum is σ = 258143669556. Its totient is φ = 190211124852.

The previous prime is 221912979031. The next prime is 221912979053. The reversal of 221912979043 is 340979219122.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-221912979043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 4528836307 = 221912979043 / (2 + 2 + 1 + 9 + 1 + 2 + 9 + 7 + 9 + 0 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221912979053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2264418105 + ... + 2264418202.

It is an arithmetic number, because the mean of its divisors is an integer number (43023944926).

Almost surely, 2^221912979043 is an apocalyptic number.

221912979043 is a deficient number, since it is larger than the sum of its proper divisors (36230690513).

221912979043 is an equidigital number, since it uses as much as digits as its factorization.

221912979043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528836321 (or 4528836314 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 221912979043 in words is "two hundred twenty-one billion, nine hundred twelve million, nine hundred seventy-nine thousand, forty-three".