851421091500 has 1152 divisors, whose sum is σ = 3366933233664. Its totient is φ = 183708000000.

The previous prime is 851421091483. The next prime is 851421091501. The reversal of 851421091500 is 5190124158.

851421091500 is a `hidden beast` number, since 8 + 5 + 1 + 42 + 109 + 1 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (851421091501) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1133716125 + ... + 1133716875.

Almost surely, 2^851421091500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851421091500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1683466616832).

851421091500 is an abundant number, since it is smaller than the sum of its proper divisors (2515512142164).

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

851421091500 is a wasteful number, since it uses less digits than its factorization.

851421091500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 851421091500 in words is "eight hundred fifty-one billion, four hundred twenty-one million, ninety-one thousand, five hundred".