221081942 has 4 divisors (see below), whose sum is σ = 331622916. Its totient is φ = 110540970.

The previous prime is 221081941. The next prime is 221081983. The reversal of 221081942 is 249180122.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221081941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55270484 + ... + 55270487.

It is an arithmetic number, because the mean of its divisors is an integer number (82905729).

Almost surely, 2^221081942 is an apocalyptic number.

221081942 is a deficient number, since it is larger than the sum of its proper divisors (110540974).

221081942 is a wasteful number, since it uses less digits than its factorization.

221081942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110540973.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 221081942 is about 14868.8244996032. The cubic root of 221081942 is about 604.6690738536.

The spelling of 221081942 in words is "two hundred twenty-one million, eighty-one thousand, nine hundred forty-two".