21221022352533 has 16 divisors (see below), whose sum is σ = 28828910408256. Its totient is φ = 13880247779840.

The previous prime is 21221022352507. The next prime is 21221022352589. The reversal of 21221022352533 is 33525322012212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21221022352533 - 2¹³ = 21221022344341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221022352494 and 21221022352503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221022352133) 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, 12992266 + ... + 14534132.

It is an arithmetic number, because the mean of its divisors is an integer number (1801806900516).

Almost surely, 2^{21221022352533} is an apocalyptic number.

It is an amenable number.

21221022352533 is a deficient number, since it is larger than the sum of its proper divisors (7607888055723).

21221022352533 is a wasteful number, since it uses less digits than its factorization.

21221022352533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628484.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 21221022352533 its reverse (33525322012212), we get a palindrome (54746344364745).

The spelling of 21221022352533 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, three hundred fifty-two thousand, five hundred thirty-three".