21455225210452 has 24 divisors (see below), whose sum is σ = 40997519008992. Its totient is φ = 9743436141600.

The previous prime is 21455225210429. The next prime is 21455225210453. The reversal of 21455225210452 is 25401252255412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455225210453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223425303 + ... + 223521310.

It is an arithmetic number, because the mean of its divisors is an integer number (1708229958708).

Almost surely, 2^{21455225210452} is an apocalyptic number.

21455225210452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21455225210452 is a deficient number, since it is larger than the sum of its proper divisors (19542293798540).

21455225210452 is a wasteful number, since it uses less digits than its factorization.

21455225210452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446947719 (or 446947717 counting only the distinct ones).

The product of its (nonzero) digits is 320000, while the sum is 40.

Adding to 21455225210452 its reverse (25401252255412), we get a palindrome (46856477465864).

The spelling of 21455225210452 in words is "twenty-one trillion, four hundred fifty-five billion, two hundred twenty-five million, two hundred ten thousand, four hundred fifty-two".