20130321987 has 16 divisors (see below), whose sum is σ = 29946454560. Its totient is φ = 13364524800.

The previous prime is 20130321973. The next prime is 20130322007. The reversal of 20130321987 is 78912303102.

It is not a de Polignac number, because 20130321987 - 2⁴ = 20130321971 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20130321907) 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 15 ways as a sum of consecutive naturals, for example, 1540314 + ... + 1553327.

It is an arithmetic number, because the mean of its divisors is an integer number (1871653410).

Almost surely, 2^20130321987 is an apocalyptic number.

20130321987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20130321987 is a deficient number, since it is larger than the sum of its proper divisors (9816132573).

20130321987 is a wasteful number, since it uses less digits than its factorization.

20130321987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093891 (or 3093885 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 20130321987 in words is "twenty billion, one hundred thirty million, three hundred twenty-one thousand, nine hundred eighty-seven".