221420352 has 56 divisors (see below), whose sum is σ = 604755712. Its totient is φ = 71424000.

The previous prime is 221420347. The next prime is 221420363. The reversal of 221420352 is 253024122.

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, 12649 + ... + 24552.

Almost surely, 2^221420352 is an apocalyptic number.

It is an amenable number.

221420352 is an abundant number, since it is smaller than the sum of its proper divisors (383335360).

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

221420352 is a wasteful number, since it uses less digits than its factorization.

221420352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37247 (or 37237 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221420352 is about 14880.1999986559. The cubic root of 221420352 is about 604.9774387689.

Adding to 221420352 its reverse (253024122), we get a palindrome (474444474).

The spelling of 221420352 in words is "two hundred twenty-one million, four hundred twenty thousand, three hundred fifty-two".