221508977948 has 36 divisors (see below), whose sum is σ = 393473967432. Its totient is φ = 109109132640.

The previous prime is 221508977941. The next prime is 221508977957. The reversal of 221508977948 is 849779805122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221508977941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8275715 + ... + 8302437.

Almost surely, 2^221508977948 is an apocalyptic number.

It is an amenable number.

221508977948 is a deficient number, since it is larger than the sum of its proper divisors (171964989484).

221508977948 is a wasteful number, since it uses less digits than its factorization.

221508977948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27122 (or 27013 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 62.

The spelling of 221508977948 in words is "two hundred twenty-one billion, five hundred eight million, nine hundred seventy-seven thousand, nine hundred forty-eight".