7121231800 has 24 divisors (see below), whose sum is σ = 16556864400. Its totient is φ = 2848492640.

The previous prime is 7121231797. The next prime is 7121231827. The reversal of 7121231800 is 81321217.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17802880 + ... + 17803279.

It is an arithmetic number, because the mean of its divisors is an integer number (689869350).

Almost surely, 2^7121231800 is an apocalyptic number.

It is an amenable number.

7121231800 is an abundant number, since it is smaller than the sum of its proper divisors (9435632600).

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

7121231800 is a wasteful number, since it uses less digits than its factorization.

7121231800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35606175 (or 35606166 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 7121231800 is about 84387.3912382650. The cubic root of 7121231800 is about 1923.9112795739.

The spelling of 7121231800 in words is "seven billion, one hundred twenty-one million, two hundred thirty-one thousand, eight hundred".