221451402 has 16 divisors (see below), whose sum is σ = 447880320. Its totient is φ = 72987552.

The previous prime is 221451361. The next prime is 221451409. The reversal of 221451402 is 204154122.

It is not an unprimeable number, because it can be changed into a prime (221451409) 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, 206818 + ... + 207885.

It is an arithmetic number, because the mean of its divisors is an integer number (27992520).

Almost surely, 2^221451402 is an apocalyptic number.

221451402 is an abundant number, since it is smaller than the sum of its proper divisors (226428918).

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

221451402 is a wasteful number, since it uses less digits than its factorization.

221451402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414797.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221451402 is about 14881.2432948326. The cubic root of 221451402 is about 605.0057163133.

The spelling of 221451402 in words is "two hundred twenty-one million, four hundred fifty-one thousand, four hundred two".