21022121113 has 32 divisors (see below), whose sum is σ = 25606471680. Its totient is φ = 16857720000.

The previous prime is 21022121077. The next prime is 21022121119. The reversal of 21022121113 is 31112122012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022121113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022121119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5787808 + ... + 5791438.

It is an arithmetic number, because the mean of its divisors is an integer number (800202240).

Almost surely, 2^21022121113 is an apocalyptic number.

It is an amenable number.

21022121113 is a deficient number, since it is larger than the sum of its proper divisors (4584350567).

21022121113 is a wasteful number, since it uses less digits than its factorization.

21022121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21022121113 its reverse (31112122012), we get a palindrome (52134243125).

The spelling of 21022121113 in words is "twenty-one billion, twenty-two million, one hundred twenty-one thousand, one hundred thirteen".