20122121986 has 16 divisors (see below), whose sum is σ = 30395230848. Its totient is φ = 9990432000.

The previous prime is 20122121843. The next prime is 20122121989. The reversal of 20122121986 is 68912122102.

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 7 ways as a sum of consecutive naturals, for example, 830946 + ... + 854818.

It is an arithmetic number, because the mean of its divisors is an integer number (1899701928).

Almost surely, 2^20122121986 is an apocalyptic number.

20122121986 is a deficient number, since it is larger than the sum of its proper divisors (10273108862).

20122121986 is a wasteful number, since it uses less digits than its factorization.

20122121986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26817.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 20122121986 in words is "twenty billion, one hundred twenty-two million, one hundred twenty-one thousand, nine hundred eighty-six".