21122112057 has 8 divisors (see below), whose sum is σ = 28179818976. Its totient is φ = 14072906592.

The previous prime is 21122112029. The next prime is 21122112103. The reversal of 21122112057 is 75021122112.

It is a happy number.

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

It is not a de Polignac number, because 21122112057 - 2⁷ = 21122111929 is a prime.

It is a super-2 number, since 2×21122112057² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122112017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2119563 + ... + 2129504.

It is an arithmetic number, because the mean of its divisors is an integer number (3522477372).

Almost surely, 2^21122112057 is an apocalyptic number.

It is an amenable number.

21122112057 is a deficient number, since it is larger than the sum of its proper divisors (7057706919).

21122112057 is a wasteful number, since it uses less digits than its factorization.

21122112057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250727.

The product of its (nonzero) digits is 560, while the sum is 24.

Adding to 21122112057 its reverse (75021122112), we get a palindrome (96143234169).

The spelling of 21122112057 in words is "twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, fifty-seven".