87373072221 has 16 divisors (see below), whose sum is σ = 123274690560. Its totient is φ = 54931424240.

The previous prime is 87373072217. The next prime is 87373072229. The reversal of 87373072221 is 12227037378.

It is a cyclic number.

It is not a de Polignac number, because 87373072221 - 2² = 87373072217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87373072229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8912541 + ... + 8922338.

It is an arithmetic number, because the mean of its divisors is an integer number (7704668160).

Almost surely, 2^87373072221 is an apocalyptic number.

It is an amenable number.

87373072221 is a deficient number, since it is larger than the sum of its proper divisors (35901618339).

87373072221 is a wasteful number, since it uses less digits than its factorization.

87373072221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17834976.

The product of its (nonzero) digits is 197568, while the sum is 42.

The spelling of 87373072221 in words is "eighty-seven billion, three hundred seventy-three million, seventy-two thousand, two hundred twenty-one".