22121351 has 4 divisors (see below), whose sum is σ = 25281552. Its totient is φ = 18961152.

The previous prime is 22121347. The next prime is 22121353. The reversal of 22121351 is 15312122.

It is a happy number.

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

It is not a de Polignac number, because 22121351 - 2² = 22121347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121353) 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, 1580090 + ... + 1580103.

It is an arithmetic number, because the mean of its divisors is an integer number (6320388).

Almost surely, 2^22121351 is an apocalyptic number.

22121351 is a deficient number, since it is larger than the sum of its proper divisors (3160201).

22121351 is an equidigital number, since it uses as much as digits as its factorization.

22121351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160200.

The product of its digits is 120, while the sum is 17.

The square root of 22121351 is about 4703.3340302385. The cubic root of 22121351 is about 280.7181860754.

Adding to 22121351 its reverse (15312122), we get a palindrome (37433473).

The spelling of 22121351 in words is "twenty-two million, one hundred twenty-one thousand, three hundred fifty-one".