21121054403131 has 8 divisors (see below), whose sum is σ = 21142297235600. Its totient is φ = 21099812186880.

The previous prime is 21121054403069. The next prime is 21121054403153. The reversal of 21121054403131 is 13130445012112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121054403131 - 2⁷ = 21121054403003 is a prime.

It is a super-2 number, since 2×21121054403131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121054403131.

It is not an unprimeable number, because it can be changed into a prime (21121054403231) 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, 102937600 + ... + 103142578.

It is an arithmetic number, because the mean of its divisors is an integer number (2642787154450).

Almost surely, 2^{21121054403131} is an apocalyptic number.

21121054403131 is a deficient number, since it is larger than the sum of its proper divisors (21242832469).

21121054403131 is a wasteful number, since it uses less digits than its factorization.

21121054403131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308109.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 21121054403131 its reverse (13130445012112), we get a palindrome (34251499415243).

The spelling of 21121054403131 in words is "twenty-one trillion, one hundred twenty-one billion, fifty-four million, four hundred three thousand, one hundred thirty-one".