21004420050087 has 32 divisors (see below), whose sum is σ = 28730589788160. Its totient is φ = 13645156072800.

The previous prime is 21004420050043. The next prime is 21004420050101. The reversal of 21004420050087 is 78005002440012.

It is not a de Polignac number, because 21004420050087 - 2¹⁵ = 21004420017319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004420057087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11640088 + ... + 13322930.

It is an arithmetic number, because the mean of its divisors is an integer number (897830930880).

Almost surely, 2^{21004420050087} is an apocalyptic number.

21004420050087 is a deficient number, since it is larger than the sum of its proper divisors (7726169738073).

21004420050087 is a wasteful number, since it uses less digits than its factorization.

21004420050087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683523.

The product of its (nonzero) digits is 17920, while the sum is 33.

Adding to 21004420050087 its reverse (78005002440012), we get a palindrome (99009422490099).

The spelling of 21004420050087 in words is "twenty-one trillion, four billion, four hundred twenty million, fifty thousand, eighty-seven".