21246551345 has 16 divisors (see below), whose sum is σ = 25623101952. Its totient is φ = 16912492800.

The previous prime is 21246551341. The next prime is 21246551441. The reversal of 21246551345 is 54315564212.

It is not a de Polignac number, because 21246551345 - 2² = 21246551341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21246551299 and 21246551308.

It is not an unprimeable number, because it can be changed into a prime (21246551341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3119714 + ... + 3126516.

It is an arithmetic number, because the mean of its divisors is an integer number (1601443872).

Almost surely, 2^21246551345 is an apocalyptic number.

It is an amenable number.

21246551345 is a deficient number, since it is larger than the sum of its proper divisors (4376550607).

21246551345 is a wasteful number, since it uses less digits than its factorization.

21246551345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9832.

The product of its digits is 144000, while the sum is 38.

The spelling of 21246551345 in words is "twenty-one billion, two hundred forty-six million, five hundred fifty-one thousand, three hundred forty-five".