131212021122021 has 48 divisors (see below), whose sum is σ = 206421108264000. Its totient is φ = 73907915864832.

The previous prime is 131212021121983. The next prime is 131212021122043. The reversal of 131212021122021 is 120221120212131.

It is not a de Polignac number, because 131212021122021 - 2³¹ = 131209873638373 is a prime.

It is a super-2 number, since 2×131212021122021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212021122121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14761930 + ... + 21916628.

It is an arithmetic number, because the mean of its divisors is an integer number (4300439755500).

Almost surely, 2^{131212021122021} is an apocalyptic number.

It is an amenable number.

131212021122021 is a deficient number, since it is larger than the sum of its proper divisors (75209087141979).

131212021122021 is a wasteful number, since it uses less digits than its factorization.

131212021122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156498 (or 7156491 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 131212021122021 its reverse (120221120212131), we get a palindrome (251433141334152).

The spelling of 131212021122021 in words is "one hundred thirty-one trillion, two hundred twelve billion, twenty-one million, one hundred twenty-two thousand, twenty-one".