21121312134031 has 8 divisors (see below), whose sum is σ = 21570768011520. Its totient is φ = 20671859017368.

The previous prime is 21121312133983. The next prime is 21121312134067. The reversal of 21121312134031 is 13043121312112.

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 21121312134031 - 2²⁷ = 21121177916303 is a prime.

It is a super-2 number, since 2×21121312134031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121312133987 and 21121312134005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121312135031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24293820 + ... + 25148206.

It is an arithmetic number, because the mean of its divisors is an integer number (2696346001440).

Almost surely, 2^{21121312134031} is an apocalyptic number.

21121312134031 is a deficient number, since it is larger than the sum of its proper divisors (449455877489).

21121312134031 is an equidigital number, since it uses as much as digits as its factorization.

21121312134031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380413.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21121312134031 its reverse (13043121312112), we get a palindrome (34164433446143).

The spelling of 21121312134031 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twelve million, one hundred thirty-four thousand, thirty-one".