210120051999 has 32 divisors (see below), whose sum is σ = 335349310464. Its totient is φ = 115331748480.

The previous prime is 210120051949. The next prime is 210120052019. The reversal of 210120051999 is 999150021012.

It is not a de Polignac number, because 210120051999 - 2¹² = 210120047903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120051929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4597927 + ... + 4643400.

It is an arithmetic number, because the mean of its divisors is an integer number (10479665952).

Almost surely, 2^210120051999 is an apocalyptic number.

210120051999 is a deficient number, since it is larger than the sum of its proper divisors (125229258465).

210120051999 is a wasteful number, since it uses less digits than its factorization.

210120051999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241407.

The product of its (nonzero) digits is 14580, while the sum is 39.

The spelling of 210120051999 in words is "two hundred ten billion, one hundred twenty million, fifty-one thousand, nine hundred ninety-nine".