101200121990 has 64 divisors (see below), whose sum is σ = 210348576000. Its totient is φ = 34668305280.

The previous prime is 101200121989. The next prime is 101200121999. The reversal of 101200121990 is 99121002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101200121999) 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, 238856 + ... + 509364.

It is an arithmetic number, because the mean of its divisors is an integer number (3286696500).

Almost surely, 2^101200121990 is an apocalyptic number.

101200121990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101200121990 is an abundant number, since it is smaller than the sum of its proper divisors (109148454010).

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

101200121990 is a wasteful number, since it uses less digits than its factorization.

101200121990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270725.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 101200121990 in words is "one hundred one billion, two hundred million, one hundred twenty-one thousand, nine hundred ninety".