21122119973 has 4 divisors (see below), whose sum is σ = 21123633888. Its totient is φ = 21120606060.

The previous prime is 21122119933. The next prime is 21122119987. The reversal of 21122119973 is 37991122112.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 21122119973 - 2¹⁸ = 21121857829 is a prime.

It is a super-2 number, since 2×21122119973² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122119933) 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, 735833 + ... + 763998.

It is an arithmetic number, because the mean of its divisors is an integer number (5280908472).

Almost surely, 2^21122119973 is an apocalyptic number.

It is an amenable number.

21122119973 is a deficient number, since it is larger than the sum of its proper divisors (1513915).

21122119973 is a wasteful number, since it uses less digits than its factorization.

21122119973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513914.

The product of its digits is 13608, while the sum is 38.

The spelling of 21122119973 in words is "twenty-one billion, one hundred twenty-two million, one hundred nineteen thousand, nine hundred seventy-three".