21513041223000 has 128 divisors (see below), whose sum is σ = 67571164440000. Its totient is φ = 5698308787200.

The previous prime is 21513041222971. The next prime is 21513041223007. The reversal of 21513041223000 is 32214031512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513041223007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23616805 + ... + 24510804.

Almost surely, 2^{21513041223000} is an apocalyptic number.

21513041223000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21513041223000 is an abundant number, since it is smaller than the sum of its proper divisors (46058123217000).

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

21513041223000 is a wasteful number, since it uses less digits than its factorization.

21513041223000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48127782 (or 48127768 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21513041223000 its reverse (32214031512), we get a palindrome (21545255254512).

The spelling of 21513041223000 in words is "twenty-one trillion, five hundred thirteen billion, forty-one million, two hundred twenty-three thousand".