221912942811 has 64 divisors (see below), whose sum is σ = 367817625600. Its totient is φ = 116168121216.

The previous prime is 221912942803. The next prime is 221912942833. The reversal of 221912942811 is 118249219122.

It is a happy number.

It is not a de Polignac number, because 221912942811 - 2³ = 221912942803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221912942011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2360260 + ... + 2452478.

It is an arithmetic number, because the mean of its divisors is an integer number (5747150400).

Almost surely, 2^221912942811 is an apocalyptic number.

221912942811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221912942811 is a deficient number, since it is larger than the sum of its proper divisors (145904682789).

221912942811 is a wasteful number, since it uses less digits than its factorization.

221912942811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92448.

The product of its digits is 41472, while the sum is 42.

The spelling of 221912942811 in words is "two hundred twenty-one billion, nine hundred twelve million, nine hundred forty-two thousand, eight hundred eleven".