21000203414224 has 20 divisors (see below), whose sum is σ = 40692669393220. Its totient is φ = 10498869377280.

The previous prime is 21000203414219. The next prime is 21000203414231. The reversal of 21000203414224 is 42241430200012.

It can be written as a sum of positive squares in 2 ways, for example, as 11824877767824 + 9175325646400 = 3438732^2 + 3029080^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76880019 + ... + 77152690.

It is an arithmetic number, because the mean of its divisors is an integer number (2034633469661).

Almost surely, 2^{21000203414224} is an apocalyptic number.

It is an amenable number.

21000203414224 is a deficient number, since it is larger than the sum of its proper divisors (19692465978996).

21000203414224 is a wasteful number, since it uses less digits than its factorization.

21000203414224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154041238 (or 154041232 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21000203414224 its reverse (42241430200012), we get a palindrome (63241633614236).

The spelling of 21000203414224 in words is "twenty-one trillion, two hundred three million, four hundred fourteen thousand, two hundred twenty-four".