21001312223131 has 16 divisors (see below), whose sum is σ = 22253165199360. Its totient is φ = 19751293609600.

The previous prime is 21001312223107. The next prime is 21001312223137. The reversal of 21001312223131 is 13132221310012.

It is a cyclic number.

It is not a de Polignac number, because 21001312223131 - 2⁹ = 21001312222619 is a prime.

It is a super-2 number, since 2×21001312223131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001312223137) 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, 246315750 + ... + 246400996.

It is an arithmetic number, because the mean of its divisors is an integer number (1390822824960).

Almost surely, 2^{21001312223131} is an apocalyptic number.

21001312223131 is a deficient number, since it is larger than the sum of its proper divisors (1251852976229).

21001312223131 is a wasteful number, since it uses less digits than its factorization.

21001312223131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95834.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21001312223131 its reverse (13132221310012), we get a palindrome (34133533533143).

The spelling of 21001312223131 in words is "twenty-one trillion, one billion, three hundred twelve million, two hundred twenty-three thousand, one hundred thirty-one".