21241502251420 has 48 divisors (see below), whose sum is σ = 48953742018048. Its totient is φ = 7677930032960.

The previous prime is 21241502251297. The next prime is 21241502251441. The reversal of 21241502251420 is 2415220514212.

It is a congruent number.

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, 289041952 + ... + 289115431.

It is an arithmetic number, because the mean of its divisors is an integer number (1019869625376).

Almost surely, 2^{21241502251420} is an apocalyptic number.

21241502251420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21241502251420 is an abundant number, since it is smaller than the sum of its proper divisors (27712239766628).

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

21241502251420 is a wasteful number, since it uses less digits than its factorization.

21241502251420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578157570 (or 578157568 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 21241502251420 its reverse (2415220514212), we get a palindrome (23656722765632).

The spelling of 21241502251420 in words is "twenty-one trillion, two hundred forty-one billion, five hundred two million, two hundred fifty-one thousand, four hundred twenty".