21032100987 has 16 divisors (see below), whose sum is σ = 29889027072. Its totient is φ = 13109212800.

The previous prime is 21032100967. The next prime is 21032100989. The reversal of 21032100987 is 78900123012.

It is not a de Polignac number, because 21032100987 - 2²⁶ = 20964992123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21032100989) 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, 1357843 + ... + 1373244.

It is an arithmetic number, because the mean of its divisors is an integer number (1868064192).

Almost surely, 2^21032100987 is an apocalyptic number.

21032100987 is a deficient number, since it is larger than the sum of its proper divisors (8856926085).

21032100987 is a wasteful number, since it uses less digits than its factorization.

21032100987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731258.

The product of its (nonzero) digits is 6048, while the sum is 33.

Adding to 21032100987 its reverse (78900123012), we get a palindrome (99932223999).

The spelling of 21032100987 in words is "twenty-one billion, thirty-two million, one hundred thousand, nine hundred eighty-seven".