21450000012 has 48 divisors (see below), whose sum is σ = 58595131392. Its totient is φ = 5979093120.

The previous prime is 21450000001. The next prime is 21450000023. The reversal of 21450000012 is 21000005412.

It is an interprime number because it is at equal distance from previous prime (21450000001) and next prime (21450000023).

It is a junction number, because it is equal to n+sod(n) for n = 21449999946 and 21450000000.

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, 3110668 + ... + 3117555.

It is an arithmetic number, because the mean of its divisors is an integer number (1220731904).

Almost surely, 2^21450000012 is an apocalyptic number.

It is an amenable number.

21450000012 is an abundant number, since it is smaller than the sum of its proper divisors (37145131380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21450000012 is a wasteful number, since it uses less digits than its factorization.

21450000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228278 (or 6228276 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21450000012 its reverse (21000005412), we get a palindrome (42450005424).

The spelling of 21450000012 in words is "twenty-one billion, four hundred fifty million, twelve", and thus it is an aban number.