21312126140250 has 64 divisors (see below), whose sum is σ = 58030982036352. Its totient is φ = 5166576032000.

The previous prime is 21312126140219. The next prime is 21312126140267. The reversal of 21312126140250 is 5204162121312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1291635759 + ... + 1291652258.

It is an arithmetic number, because the mean of its divisors is an integer number (906734094318).

Almost surely, 2^{21312126140250} is an apocalyptic number.

21312126140250 is an abundant number, since it is smaller than the sum of its proper divisors (36718855896102).

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

21312126140250 is a wasteful number, since it uses less digits than its factorization.

21312126140250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583288048 (or 2583288038 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 21312126140250 its reverse (5204162121312), we get a palindrome (26516288261562).

The spelling of 21312126140250 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-six million, one hundred forty thousand, two hundred fifty".