100222421 has 4 divisors (see below), whose sum is σ = 107931852. Its totient is φ = 92512992.

The previous prime is 100222373. The next prime is 100222433. The reversal of 100222421 is 124222001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63377521 + 36844900 = 7961^2 + 6070^2 .

It is a de Polignac number, because none of the positive numbers 2^k-100222421 is a prime.

It is a super-2 number, since 2×100222421² = 20089067342202482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100222396 and 100222405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100222921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3854696 + ... + 3854721.

It is an arithmetic number, because the mean of its divisors is an integer number (26982963).

Almost surely, 2^100222421 is an apocalyptic number.

It is an amenable number.

100222421 is a deficient number, since it is larger than the sum of its proper divisors (7709431).

100222421 is an equidigital number, since it uses as much as digits as its factorization.

100222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7709430.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 100222421 is about 10011.1148729799. The cubic root of 100222421 is about 464.5027574811.

Adding to 100222421 its reverse (124222001), we get a palindrome (224444422).

The spelling of 100222421 in words is "one hundred million, two hundred twenty-two thousand, four hundred twenty-one".