21514215001205 has 16 divisors (see below), whose sum is σ = 26051424357504. Its totient is φ = 17055799784640.

The previous prime is 21514215001183. The next prime is 21514215001219. The reversal of 21514215001205 is 50210051241512.

It is not a de Polignac number, because 21514215001205 - 2²⁰ = 21514213952629 is a prime.

It is a super-2 number, since 2×21514215001205² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41744969 + ... + 42257198.

It is an arithmetic number, because the mean of its divisors is an integer number (1628214022344).

Almost surely, 2^{21514215001205} is an apocalyptic number.

It is an amenable number.

21514215001205 is a deficient number, since it is larger than the sum of its proper divisors (4537209356299).

21514215001205 is a wasteful number, since it uses less digits than its factorization.

21514215001205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84002636.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 21514215001205 its reverse (50210051241512), we get a palindrome (71724266242717).

The spelling of 21514215001205 in words is "twenty-one trillion, five hundred fourteen billion, two hundred fifteen million, one thousand, two hundred five".