21450000013 has 24 divisors (see below), whose sum is σ = 23811667200. Its totient is φ = 19304760384.

The previous prime is 21450000001. The next prime is 21450000023. The reversal of 21450000013 is 31000005412.

It is not a de Polignac number, because 21450000013 - 2¹⁷ = 21449868941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2131648 + ... + 2141686.

It is an arithmetic number, because the mean of its divisors is an integer number (992152800).

Almost surely, 2^21450000013 is an apocalyptic number.

It is an amenable number.

21450000013 is a deficient number, since it is larger than the sum of its proper divisors (2361667187).

21450000013 is a wasteful number, since it uses less digits than its factorization.

21450000013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381 (or 10368 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 21450000013 its reverse (31000005412), we get a palindrome (52450005425).

The spelling of 21450000013 in words is "twenty-one billion, four hundred fifty million, thirteen", and thus it is an aban number.