10200121987 has 4 divisors (see below), whose sum is σ = 11127405816. Its totient is φ = 9272838160.

The previous prime is 10200121973. The next prime is 10200121991. The reversal of 10200121987 is 78912100201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10200121987 - 2¹¹ = 10200119939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10200121387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463641898 + ... + 463641919.

It is an arithmetic number, because the mean of its divisors is an integer number (2781851454).

Almost surely, 2^10200121987 is an apocalyptic number.

10200121987 is a deficient number, since it is larger than the sum of its proper divisors (927283829).

10200121987 is an equidigital number, since it uses as much as digits as its factorization.

10200121987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927283828.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 10200121987 in words is "ten billion, two hundred million, one hundred twenty-one thousand, nine hundred eighty-seven".