221502040 has 16 divisors (see below), whose sum is σ = 498379680. Its totient is φ = 88600800.

The previous prime is 221501963. The next prime is 221502053. The reversal of 221502040 is 40205122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2768736 + ... + 2768815.

It is an arithmetic number, because the mean of its divisors is an integer number (31148730).

Almost surely, 2^221502040 is an apocalyptic number.

221502040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221502040 is an abundant number, since it is smaller than the sum of its proper divisors (276877640).

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

221502040 is a wasteful number, since it uses less digits than its factorization.

221502040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5537562 (or 5537558 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 221502040 is about 14882.9446011198. The cubic root of 221502040 is about 605.0518271745.

Adding to 221502040 its reverse (40205122), we get a palindrome (261707162).

The spelling of 221502040 in words is "two hundred twenty-one million, five hundred two thousand, forty".