21253212052633 has 16 divisors (see below), whose sum is σ = 23397820781760. Its totient is φ = 19144788006400.

The previous prime is 21253212052613. The next prime is 21253212052637. The reversal of 21253212052633 is 33625021235212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21253212052633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21253212052592 and 21253212052601.

It is not an unprimeable number, because it can be changed into a prime (21253212052637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18652960 + ... + 19759537.

It is an arithmetic number, because the mean of its divisors is an integer number (1462363798860).

Almost surely, 2^{21253212052633} is an apocalyptic number.

It is an amenable number.

21253212052633 is a deficient number, since it is larger than the sum of its proper divisors (2144608729127).

21253212052633 is a wasteful number, since it uses less digits than its factorization.

21253212052633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38412968.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 21253212052633 its reverse (33625021235212), we get a palindrome (54878233287845).

The spelling of 21253212052633 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred twelve million, fifty-two thousand, six hundred thirty-three".