842737221 has 24 divisors (see below), whose sum is σ = 1232892960. Its totient is φ = 554669856.

The previous prime is 842737219. The next prime is 842737237. The reversal of 842737221 is 122737248.

842737221 is a `hidden beast` number, since 8 + 427 + 3 + 7 + 221 = 666.

It is not a de Polignac number, because 842737221 - 2¹ = 842737219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842737211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228490 + ... + 232148.

It is an arithmetic number, because the mean of its divisors is an integer number (51370540).

Almost surely, 2^842737221 is an apocalyptic number.

It is an amenable number.

842737221 is a deficient number, since it is larger than the sum of its proper divisors (390155739).

842737221 is a wasteful number, since it uses less digits than its factorization.

842737221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985 (or 3982 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 842737221 is about 29029.9366344469. The cubic root of 842737221 is about 944.5625555779.

The spelling of 842737221 in words is "eight hundred forty-two million, seven hundred thirty-seven thousand, two hundred twenty-one".