221002024 has 16 divisors (see below), whose sum is σ = 421172820. Its totient is φ = 108689280.

The previous prime is 221002021. The next prime is 221002031. The reversal of 221002024 is 420200122.

It can be written as a sum of positive squares in 2 ways, for example, as 164301124 + 56700900 = 12818^2 + 7530^2 .

It is a super-2 number, since 2×221002024² = 97683789224193152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221001995 and 221002013.

It is not an unprimeable number, because it can be changed into a prime (221002021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225949 + ... + 226924.

Almost surely, 2^221002024 is an apocalyptic number.

It is an amenable number.

221002024 is a deficient number, since it is larger than the sum of its proper divisors (200170796).

221002024 is a wasteful number, since it uses less digits than its factorization.

221002024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452940 (or 452936 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 221002024 is about 14866.1368216494. The cubic root of 221002024 is about 604.5962052954.

Adding to 221002024 its reverse (420200122), we get a palindrome (641202146).

The spelling of 221002024 in words is "two hundred twenty-one million, two thousand, twenty-four".