21004420050086 has 16 divisors (see below), whose sum is σ = 34479294639120. Its totient is φ = 9517345474080.

The previous prime is 21004420050043. The next prime is 21004420050101. The reversal of 21004420050086 is 68005002440012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1505902121 + ... + 1505916068.

It is an arithmetic number, because the mean of its divisors is an integer number (2154955914945).

Almost surely, 2^{21004420050086} is an apocalyptic number.

21004420050086 is a deficient number, since it is larger than the sum of its proper divisors (13474874589034).

21004420050086 is a wasteful number, since it uses less digits than its factorization.

21004420050086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011818519.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21004420050086 its reverse (68005002440012), we get a palindrome (89009422490098).

The spelling of 21004420050086 in words is "twenty-one trillion, four billion, four hundred twenty million, fifty thousand, eighty-six".