21153424031 has 8 divisors (see below), whose sum is σ = 21726983664. Its totient is φ = 20579961600.

The previous prime is 21153424013. The next prime is 21153424067. The reversal of 21153424031 is 13042435112.

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 21153424031 - 2³⁴ = 3973554847 is a prime.

It is a super-2 number, since 2×21153424031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153420031) 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, 727631 + ... + 756143.

It is an arithmetic number, because the mean of its divisors is an integer number (2715872958).

Almost surely, 2^21153424031 is an apocalyptic number.

21153424031 is a deficient number, since it is larger than the sum of its proper divisors (573559633).

21153424031 is a wasteful number, since it uses less digits than its factorization.

21153424031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48601.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21153424031 its reverse (13042435112), we get a palindrome (34195859143).

The spelling of 21153424031 in words is "twenty-one billion, one hundred fifty-three million, four hundred twenty-four thousand, thirty-one".