21041451055020 has 48 divisors (see below), whose sum is σ = 64272068679168. Its totient is φ = 5100957831360.

The previous prime is 21041451054971. The next prime is 21041451055099. The reversal of 21041451055020 is 2055015414012.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 15940492564 + ... + 15940493883.

It is an arithmetic number, because the mean of its divisors is an integer number (1339001430816).

Almost surely, 2^{21041451055020} is an apocalyptic number.

21041451055020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041451055020 is an abundant number, since it is smaller than the sum of its proper divisors (43230617624148).

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

21041451055020 is a wasteful number, since it uses less digits than its factorization.

21041451055020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31880986470 (or 31880986468 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 21041451055020 its reverse (2055015414012), we get a palindrome (23096466469032).

The spelling of 21041451055020 in words is "twenty-one trillion, forty-one billion, four hundred fifty-one million, fifty-five thousand, twenty".