21201001533 has 16 divisors (see below), whose sum is σ = 32077167360. Its totient is φ = 13833276768.

The previous prime is 21201001519. The next prime is 21201001537. The reversal of 21201001533 is 33510010212.

21201001533 is a `hidden beast` number, since 2 + 120 + 10 + 0 + 1 + 533 = 666.

It is not a de Polignac number, because 21201001533 - 2⁶ = 21201001469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201001537) 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, 8352160 + ... + 8354697.

It is an arithmetic number, because the mean of its divisors is an integer number (2004822960).

Almost surely, 2^21201001533 is an apocalyptic number.

It is an amenable number.

21201001533 is a deficient number, since it is larger than the sum of its proper divisors (10876165827).

21201001533 is a wasteful number, since it uses less digits than its factorization.

21201001533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16706913 (or 16706907 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21201001533 its reverse (33510010212), we get a palindrome (54711011745).

The spelling of 21201001533 in words is "twenty-one billion, two hundred one million, one thousand, five hundred thirty-three".