221942653542 has 24 divisors (see below), whose sum is σ = 486669436344. Its totient is φ = 73089548064.

The previous prime is 221942653531. The next prime is 221942653613. The reversal of 221942653542 is 245356249122.

221942653542 is a `hidden beast` number, since 2 + 2 + 1 + 9 + 42 + 65 + 3 + 542 = 666.

It is a super-2 number, since 2×221942653542² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74276503 + ... + 74279490.

It is an arithmetic number, because the mean of its divisors is an integer number (20277893181).

Almost surely, 2^221942653542 is an apocalyptic number.

221942653542 is an abundant number, since it is smaller than the sum of its proper divisors (264726782802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221942653542 is a wasteful number, since it uses less digits than its factorization.

221942653542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148556084 (or 148556081 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 221942653542 in words is "two hundred twenty-one billion, nine hundred forty-two million, six hundred fifty-three thousand, five hundred forty-two".