22121742 has 8 divisors (see below), whose sum is σ = 44243496. Its totient is φ = 7373912.

The previous prime is 22121717. The next prime is 22121761. The reversal of 22121742 is 24712122.

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

22121742 is an admirable number.

It is a super-2 number, since 2×22121742² = 978742938229128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843473 + ... + 1843484.

It is an arithmetic number, because the mean of its divisors is an integer number (5530437).

Almost surely, 2^22121742 is an apocalyptic number.

22121742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22121742 is a wasteful number, since it uses less digits than its factorization.

22121742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686962.

The product of its digits is 448, while the sum is 21.

The square root of 22121742 is about 4703.3755963138. The cubic root of 22121742 is about 280.7198399853.

Adding to 22121742 its reverse (24712122), we get a palindrome (46833864).

The spelling of 22121742 in words is "twenty-two million, one hundred twenty-one thousand, seven hundred forty-two".