21445015460 has 48 divisors (see below), whose sum is σ = 49140205632. Its totient is φ = 7796342400.

The previous prime is 21445015433. The next prime is 21445015499. The reversal of 21445015460 is 6451054412.

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, 1217315 + ... + 1234805.

It is an arithmetic number, because the mean of its divisors is an integer number (1023754284).

Almost surely, 2^21445015460 is an apocalyptic number.

21445015460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21445015460 is an abundant number, since it is smaller than the sum of its proper divisors (27695190172).

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

21445015460 is a wasteful number, since it uses less digits than its factorization.

21445015460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23084 (or 23082 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21445015460 its reverse (6451054412), we get a palindrome (27896069872).

The spelling of 21445015460 in words is "twenty-one billion, four hundred forty-five million, fifteen thousand, four hundred sixty".