221406952 has 32 divisors (see below), whose sum is σ = 447763680. Its totient is φ = 102029760.

The previous prime is 221406907. The next prime is 221406959. The reversal of 221406952 is 259604122.

221406952 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221406959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90627 + ... + 93037.

It is an arithmetic number, because the mean of its divisors is an integer number (13992615).

Almost surely, 2^221406952 is an apocalyptic number.

It is an amenable number.

221406952 is an abundant number, since it is smaller than the sum of its proper divisors (226356728).

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

221406952 is a wasteful number, since it uses less digits than its factorization.

221406952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313 (or 3309 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 221406952 is about 14879.7497290781. The cubic root of 221406952 is about 604.9652344388.

It can be divided in two parts, 22140 and 6952, that added together give a palindrome (29092).

The spelling of 221406952 in words is "two hundred twenty-one million, four hundred six thousand, nine hundred fifty-two".