221046256646520 has 128 divisors (see below), whose sum is σ = 663319488061440. Its totient is φ = 58929607296000.

The previous prime is 221046256646503. The next prime is 221046256646603. The reversal of 221046256646520 is 25646652640122.

221046256646520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221046256646520² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8925019177 + ... + 8925043943.

It is an arithmetic number, because the mean of its divisors is an integer number (5182183500480).

Almost surely, 2^{221046256646520} is an apocalyptic number.

221046256646520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221046256646520 is an abundant number, since it is smaller than the sum of its proper divisors (442273231414920).

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

221046256646520 is a wasteful number, since it uses less digits than its factorization.

221046256646520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42045 (or 42041 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 51.

The spelling of 221046256646520 in words is "two hundred twenty-one trillion, forty-six billion, two hundred fifty-six million, six hundred forty-six thousand, five hundred twenty".