102121323140 has 12 divisors (see below), whose sum is σ = 214454778636. Its totient is φ = 40848529248.

The previous prime is 102121323107. The next prime is 102121323163. The reversal of 102121323140 is 41323121201.

It can be written as a sum of positive squares in 2 ways, for example, as 75217450564 + 26903872576 = 274258^2 + 164024^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 5106066157 = 102121323140 / (1 + 0 + 2 + 1 + 2 + 1 + 3 + 2 + 3 + 1 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2553033059 + ... + 2553033098.

It is an arithmetic number, because the mean of its divisors is an integer number (17871231553).

Almost surely, 2^102121323140 is an apocalyptic number.

102121323140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102121323140 is an abundant number, since it is smaller than the sum of its proper divisors (112333455496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102121323140 is a wasteful number, since it uses less digits than its factorization.

102121323140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106066166 (or 5106066164 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 102121323140 its reverse (41323121201), we get a palindrome (143444444341).

The spelling of 102121323140 in words is "one hundred two billion, one hundred twenty-one million, three hundred twenty-three thousand, one hundred forty".