21425210501015 has 16 divisors (see below), whose sum is σ = 25881098636736. Its totient is φ = 17026276128000.

The previous prime is 21425210500999. The next prime is 21425210501041. The reversal of 21425210501015 is 51010501252412.

It is not a de Polignac number, because 21425210501015 - 2⁴ = 21425210500999 is a prime.

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, 36203939 + ... + 36790971.

It is an arithmetic number, because the mean of its divisors is an integer number (1617568664796).

Almost surely, 2^{21425210501015} is an apocalyptic number.

21425210501015 is a deficient number, since it is larger than the sum of its proper divisors (4455888135721).

21425210501015 is a wasteful number, since it uses less digits than its factorization.

21425210501015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635530.

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

Adding to 21425210501015 its reverse (51010501252412), we get a palindrome (72435711753427).

The spelling of 21425210501015 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred ten million, five hundred one thousand, fifteen".