221628433724742 has 32 divisors (see below), whose sum is σ = 495346920614784. Its totient is φ = 65522079444800.

The previous prime is 221628433724671. The next prime is 221628433724771. The reversal of 221628433724742 is 247427334826122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40951296948 + ... + 40951302359.

It is an arithmetic number, because the mean of its divisors is an integer number (15479591269212).

Almost surely, 2^{221628433724742} is an apocalyptic number.

221628433724742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221628433724742 is an abundant number, since it is smaller than the sum of its proper divisors (273718486890042).

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

221628433724742 is a wasteful number, since it uses less digits than its factorization.

221628433724742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81902599364.

The product of its digits is 43352064, while the sum is 57.

The spelling of 221628433724742 in words is "two hundred twenty-one trillion, six hundred twenty-eight billion, four hundred thirty-three million, seven hundred twenty-four thousand, seven hundred forty-two".