221542630 has 8 divisors (see below), whose sum is σ = 398776752. Its totient is φ = 88617048.

The previous prime is 221542613. The next prime is 221542681. The reversal of 221542630 is 36245122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×221542630² = 98162273814633800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221542595 and 221542604.

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, 11077122 + ... + 11077141.

It is an arithmetic number, because the mean of its divisors is an integer number (49847094).

Almost surely, 2^221542630 is an apocalyptic number.

221542630 is a deficient number, since it is larger than the sum of its proper divisors (177234122).

221542630 is a wasteful number, since it uses less digits than its factorization.

221542630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22154270.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 221542630 is about 14884.3081800936. The cubic root of 221542630 is about 605.0887832731.

Adding to 221542630 its reverse (36245122), we get a palindrome (257787752).

The spelling of 221542630 in words is "two hundred twenty-one million, five hundred forty-two thousand, six hundred thirty".