21122122993 has 16 divisors (see below), whose sum is σ = 21811939200. Its totient is φ = 20438839296.

The previous prime is 21122122981. The next prime is 21122122997. The reversal of 21122122993 is 39922122112.

It is a cyclic number.

It is not a de Polignac number, because 21122122993 - 2¹³ = 21122114801 is a prime.

It is a super-2 number, since 2×21122122993² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122122997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7824558 + ... + 7827256.

It is an arithmetic number, because the mean of its divisors is an integer number (1363246200).

Almost surely, 2^21122122993 is an apocalyptic number.

It is an amenable number.

21122122993 is a deficient number, since it is larger than the sum of its proper divisors (689816207).

21122122993 is a wasteful number, since it uses less digits than its factorization.

21122122993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816.

The product of its digits is 7776, while the sum is 34.

The spelling of 21122122993 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, nine hundred ninety-three".