2121125231500 has 48 divisors (see below), whose sum is σ = 5053677291936. Its totient is φ = 771318264000.

The previous prime is 2121125231443. The next prime is 2121125231509. The reversal of 2121125231500 is 51325211212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (2121125231509) 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, 192824067 + ... + 192835066.

It is an arithmetic number, because the mean of its divisors is an integer number (105284943582).

Almost surely, 2^{2121125231500} is an apocalyptic number.

2121125231500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121125231500 is an abundant number, since it is smaller than the sum of its proper divisors (2932552060436).

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

2121125231500 is a wasteful number, since it uses less digits than its factorization.

2121125231500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385659163 (or 385659151 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 2121125231500 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-five million, two hundred thirty-one thousand, five hundred".