102021013121531 has 8 divisors (see below), whose sum is σ = 116596299132384. Its totient is φ = 87445941001920.

The previous prime is 102021013121497. The next prime is 102021013121539. The reversal of 102021013121531 is 135121310120201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102021013121531 is a prime.

It is a super-2 number, since 2×102021013121531² (a number of 29 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 = 102021013121497 and 102021013121506.

It is not an unprimeable number, because it can be changed into a prime (102021013121539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52449410 + ... + 54359751.

It is an arithmetic number, because the mean of its divisors is an integer number (14574537391548).

Almost surely, 2^{102021013121531} is an apocalyptic number.

102021013121531 is a deficient number, since it is larger than the sum of its proper divisors (14575286010853).

102021013121531 is a wasteful number, since it uses less digits than its factorization.

102021013121531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106945621.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 102021013121531 its reverse (135121310120201), we get a palindrome (237142323241732).

The spelling of 102021013121531 in words is "one hundred two trillion, twenty-one billion, thirteen million, one hundred twenty-one thousand, five hundred thirty-one".