221755015493 has 32 divisors (see below), whose sum is σ = 248209920000. Its totient is φ = 196391715520.

The previous prime is 221755015463. The next prime is 221755015511. The reversal of 221755015493 is 394510557122.

It is not a de Polignac number, because 221755015493 - 2⁶ = 221755015429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221755015463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129756323 + ... + 129758031.

It is an arithmetic number, because the mean of its divisors is an integer number (7756560000).

Almost surely, 2^221755015493 is an apocalyptic number.

It is an amenable number.

221755015493 is a deficient number, since it is larger than the sum of its proper divisors (26454904507).

221755015493 is a wasteful number, since it uses less digits than its factorization.

221755015493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 221755015493 in words is "two hundred twenty-one billion, seven hundred fifty-five million, fifteen thousand, four hundred ninety-three".