20122121988 has 72 divisors (see below), whose sum is σ = 54015343200. Its totient is φ = 6298096896.

The previous prime is 20122121843. The next prime is 20122121989. The reversal of 20122121988 is 88912122102.

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 (20122121989) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 52878 + ... + 207461.

It is an arithmetic number, because the mean of its divisors is an integer number (750213100).

Almost surely, 2^20122121988 is an apocalyptic number.

It is an amenable number.

20122121988 is an abundant number, since it is smaller than the sum of its proper divisors (33893221212).

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

20122121988 is a wasteful number, since it uses less digits than its factorization.

20122121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260481 (or 260476 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 20122121988 in words is "twenty billion, one hundred twenty-two million, one hundred twenty-one thousand, nine hundred eighty-eight".