21022121131 has 8 divisors (see below), whose sum is σ = 23421164544. Its totient is φ = 18704401320.

The previous prime is 21022121119. The next prime is 21022121147. The reversal of 21022121131 is 13112122012.

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

It is not a de Polignac number, because 21022121131 - 2²¹ = 21020023979 is a prime.

It is a super-2 number, since 2×21022121131² (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 (21022151131) 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, 20330355 + ... + 20331388.

It is an arithmetic number, because the mean of its divisors is an integer number (2927645568).

Almost surely, 2^21022121131 is an apocalyptic number.

21022121131 is a deficient number, since it is larger than the sum of its proper divisors (2399043413).

21022121131 is a wasteful number, since it uses less digits than its factorization.

21022121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40661801.

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

Adding to 21022121131 its reverse (13112122012), we get a palindrome (34134243143).

The spelling of 21022121131 in words is "twenty-one billion, twenty-two million, one hundred twenty-one thousand, one hundred thirty-one".