221023041520 has 40 divisors (see below), whose sum is σ = 513954511056. Its totient is φ = 88396151808.

The previous prime is 221023041517. The next prime is 221023041581. The reversal of 221023041520 is 25140320122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 221023041491 and 221023041500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349944 + ... + 751336.

Almost surely, 2^221023041520 is an apocalyptic number.

221023041520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221023041520 is an abundant number, since it is smaller than the sum of its proper divisors (292931469536).

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

221023041520 is a wasteful number, since it uses less digits than its factorization.

221023041520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408289 (or 408283 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 221023041520 its reverse (25140320122), we get a palindrome (246163361642).

The spelling of 221023041520 in words is "two hundred twenty-one billion, twenty-three million, forty-one thousand, five hundred twenty".