21004250213244 has 24 divisors (see below), whose sum is σ = 49022203542480. Its totient is φ = 6999661540864.

The previous prime is 21004250213237. The next prime is 21004250213257. The reversal of 21004250213244 is 44231205240012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219349749 + ... + 219445484.

It is an arithmetic number, because the mean of its divisors is an integer number (2042591814270).

Almost surely, 2^{21004250213244} is an apocalyptic number.

It is an amenable number.

21004250213244 is an abundant number, since it is smaller than the sum of its proper divisors (28017953329236).

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

21004250213244 is a wasteful number, since it uses less digits than its factorization.

21004250213244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438799229 (or 438799227 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21004250213244 its reverse (44231205240012), we get a palindrome (65235455453256).

The spelling of 21004250213244 in words is "twenty-one trillion, four billion, two hundred fifty million, two hundred thirteen thousand, two hundred forty-four".