21224544621020 has 96 divisors (see below), whose sum is σ = 48144820445568. Its totient is φ = 7813159391232.

The previous prime is 21224544621019. The next prime is 21224544621037. The reversal of 21224544621020 is 2012644542212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145243832 + ... + 145389888.

It is an arithmetic number, because the mean of its divisors is an integer number (501508546308).

Almost surely, 2^{21224544621020} is an apocalyptic number.

21224544621020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224544621020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24072410222784).

21224544621020 is an abundant number, since it is smaller than the sum of its proper divisors (26920275824548).

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

21224544621020 is a wasteful number, since it uses less digits than its factorization.

21224544621020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147759 (or 147757 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

The spelling of 21224544621020 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred forty-four million, six hundred twenty-one thousand, twenty".