21153051533 has 8 divisors (see below), whose sum is σ = 22918218048. Its totient is φ = 19445759424.

The previous prime is 21153051509. The next prime is 21153051541. The reversal of 21153051533 is 33515035112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21153051533 - 2¹⁰ = 21153050509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21153051496 and 21153051505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153051133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14467841 + ... + 14469302.

It is an arithmetic number, because the mean of its divisors is an integer number (2864777256).

Almost surely, 2^21153051533 is an apocalyptic number.

It is an amenable number.

21153051533 is a deficient number, since it is larger than the sum of its proper divisors (1765166515).

21153051533 is a wasteful number, since it uses less digits than its factorization.

21153051533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28937203.

The product of its (nonzero) digits is 6750, while the sum is 29.

Adding to 21153051533 its reverse (33515035112), we get a palindrome (54668086645).

The spelling of 21153051533 in words is "twenty-one billion, one hundred fifty-three million, fifty-one thousand, five hundred thirty-three".