101992011820 has 48 divisors (see below), whose sum is σ = 220374977760. Its totient is φ = 39621464064.

The previous prime is 101992011791. The next prime is 101992011833. The reversal of 101992011820 is 28110299101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278796 + ... + 530764.

It is an arithmetic number, because the mean of its divisors is an integer number (4591145370).

Almost surely, 2^101992011820 is an apocalyptic number.

101992011820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101992011820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110187488880).

101992011820 is an abundant number, since it is smaller than the sum of its proper divisors (118382965940).

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

101992011820 is a wasteful number, since it uses less digits than its factorization.

101992011820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252562 (or 252560 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 101992011820 in words is "one hundred one billion, nine hundred ninety-two million, eleven thousand, eight hundred twenty".