221145923934 has 24 divisors (see below), whose sum is σ = 516007156392. Its totient is φ = 68044899600.

The previous prime is 221145923927. The next prime is 221145923939. The reversal of 221145923934 is 439329541122.

221145923934 is a `hidden beast` number, since 2 + 21 + 1 + 4 + 592 + 3 + 9 + 34 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221145923934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221145923939) 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, 472533792 + ... + 472534259.

It is an arithmetic number, because the mean of its divisors is an integer number (21500298183).

Almost surely, 2^221145923934 is an apocalyptic number.

221145923934 is an abundant number, since it is smaller than the sum of its proper divisors (294861232458).

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

221145923934 is a wasteful number, since it uses less digits than its factorization.

221145923934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945068072 (or 945068069 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 221145923934 in words is "two hundred twenty-one billion, one hundred forty-five million, nine hundred twenty-three thousand, nine hundred thirty-four".