21224353631452 has 24 divisors (see below), whose sum is σ = 37290742527024. Its totient is φ = 10569884616192.

The previous prime is 21224353631449. The next prime is 21224353631483. The reversal of 21224353631452 is 25413635342212.

It is a junction number, because it is equal to n+sod(n) for n = 21224353631399 and 21224353631408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660778 + ... + 6548689.

It is an arithmetic number, because the mean of its divisors is an integer number (1553780938626).

Almost surely, 2^{21224353631452} is an apocalyptic number.

It is an amenable number.

21224353631452 is a deficient number, since it is larger than the sum of its proper divisors (16066388895572).

21224353631452 is a wasteful number, since it uses less digits than its factorization.

21224353631452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7212405 (or 7212403 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 43.

Adding to 21224353631452 its reverse (25413635342212), we get a palindrome (46637988973664).

The spelling of 21224353631452 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred fifty-three million, six hundred thirty-one thousand, four hundred fifty-two".