221525041536445 has 16 divisors (see below), whose sum is σ = 267223750483968. Its totient is φ = 176290912805760.

The previous prime is 221525041536289. The next prime is 221525041536499. The reversal of 221525041536445 is 544635140525122.

It is not a de Polignac number, because 221525041536445 - 2¹⁵ = 221525041503677 is a prime.

It is a Duffinian number.

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, 145594057 + ... + 147107713.

It is an arithmetic number, because the mean of its divisors is an integer number (16701484405248).

Almost surely, 2^{221525041536445} is an apocalyptic number.

It is an amenable number.

221525041536445 is a deficient number, since it is larger than the sum of its proper divisors (45698708947523).

221525041536445 is a wasteful number, since it uses less digits than its factorization.

221525041536445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667100.

The product of its (nonzero) digits is 5760000, while the sum is 49.

The spelling of 221525041536445 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, forty-one million, five hundred thirty-six thousand, four hundred forty-five".