22100402 has 4 divisors (see below), whose sum is σ = 33150606. Its totient is φ = 11050200.

The previous prime is 22100347. The next prime is 22100431. The reversal of 22100402 is 20400122.

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

It can be written as a sum of positive squares in only one way, i.e., 11282881 + 10817521 = 3359^2 + 3289^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5525099 + ... + 5525102.

Almost surely, 2^22100402 is an apocalyptic number.

22100402 is a deficient number, since it is larger than the sum of its proper divisors (11050204).

22100402 is a wasteful number, since it uses less digits than its factorization.

22100402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11050203.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22100402 is about 4701.1064655036. The cubic root of 22100402 is about 280.6295443731.

Adding to 22100402 its reverse (20400122), we get a palindrome (42500524).

The spelling of 22100402 in words is "twenty-two million, one hundred thousand, four hundred two".