21236000245 has 16 divisors (see below), whose sum is σ = 27362251008. Its totient is φ = 15764250880.

The previous prime is 21236000239. The next prime is 21236000251. The reversal of 21236000245 is 54200063212.

It is an interprime number because it is at equal distance from previous prime (21236000239) and next prime (21236000251).

It is not a de Polignac number, because 21236000245 - 2¹⁵ = 21235967477 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, 1753369 + ... + 1765438.

It is an arithmetic number, because the mean of its divisors is an integer number (1710140688).

Almost surely, 2^21236000245 is an apocalyptic number.

It is an amenable number.

21236000245 is a deficient number, since it is larger than the sum of its proper divisors (6126250763).

21236000245 is a wasteful number, since it uses less digits than its factorization.

21236000245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518900.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21236000245 its reverse (54200063212), we get a palindrome (75436063457).

The spelling of 21236000245 in words is "twenty-one billion, two hundred thirty-six million, two hundred forty-five", and thus it is an aban number.