21433436350625 has 20 divisors (see below), whose sum is σ = 28843469925732. Its totient is φ = 15827768376000.

The previous prime is 21433436350621. The next prime is 21433436350649. The reversal of 21433436350625 is 52605363433412.

It can be written as a sum of positive squares in 10 ways, for example, as 21291053893729 + 142382456896 = 4614223^2 + 377336^2 .

It is not a de Polignac number, because 21433436350625 - 2² = 21433436350621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21433436350625.

It is not an unprimeable number, because it can be changed into a prime (21433436350621) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1318972574 + ... + 1318988823.

Almost surely, 2^{21433436350625} is an apocalyptic number.

21433436350625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21433436350625 is a deficient number, since it is larger than the sum of its proper divisors (7410033575107).

21433436350625 is an equidigital number, since it uses as much as digits as its factorization.

21433436350625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637961430 (or 2637961415 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 47.

The spelling of 21433436350625 in words is "twenty-one trillion, four hundred thirty-three billion, four hundred thirty-six million, three hundred fifty thousand, six hundred twenty-five".