20121001985 has 32 divisors (see below), whose sum is σ = 27880934400. Its totient is φ = 13654630080.

The previous prime is 20121001973. The next prime is 20121001987. The reversal of 20121001985 is 58910012102.

It is not a de Polignac number, because 20121001985 - 2⁶ = 20121001921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121001987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1731926 + ... + 1743504.

It is an arithmetic number, because the mean of its divisors is an integer number (871279200).

Almost surely, 2^20121001985 is an apocalyptic number.

It is an amenable number.

20121001985 is a deficient number, since it is larger than the sum of its proper divisors (7759932415).

20121001985 is a wasteful number, since it uses less digits than its factorization.

20121001985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12101.

The product of its (nonzero) digits is 1440, while the sum is 29.

The spelling of 20121001985 in words is "twenty billion, one hundred twenty-one million, one thousand, nine hundred eighty-five".