221501770148 has 12 divisors (see below), whose sum is σ = 387682157772. Its totient is φ = 110735439360.

The previous prime is 221501770129. The next prime is 221501770211. The reversal of 221501770148 is 841077105122.

It can be written as a sum of positive squares in 2 ways, for example, as 95442687844 + 126059082304 = 308938^2 + 355048^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3829133 + ... + 3886548.

It is an arithmetic number, because the mean of its divisors is an integer number (32306846481).

Almost surely, 2^221501770148 is an apocalyptic number.

It is an amenable number.

221501770148 is a deficient number, since it is larger than the sum of its proper divisors (166180387624).

221501770148 is a wasteful number, since it uses less digits than its factorization.

221501770148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7722862 (or 7722860 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The spelling of 221501770148 in words is "two hundred twenty-one billion, five hundred one million, seven hundred seventy thousand, one hundred forty-eight".