22121057 has 4 divisors (see below), whose sum is σ = 25281216. Its totient is φ = 18960900.

The previous prime is 22121051. The next prime is 22121059. The reversal of 22121057 is 75012122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75012122 = 2 ⋅37506061.

It is not a de Polignac number, because 22121057 - 2⁴ = 22121041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121051) 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, 1580069 + ... + 1580082.

It is an arithmetic number, because the mean of its divisors is an integer number (6320304).

Almost surely, 2^22121057 is an apocalyptic number.

It is an amenable number.

22121057 is a deficient number, since it is larger than the sum of its proper divisors (3160159).

22121057 is an equidigital number, since it uses as much as digits as its factorization.

22121057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160158.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 22121057 is about 4703.3027757099. The cubic root of 22121057 is about 280.7169424576.

Adding to 22121057 its reverse (75012122), we get a palindrome (97133179).

The spelling of 22121057 in words is "twenty-two million, one hundred twenty-one thousand, fifty-seven".