21006210633 has 8 divisors (see below), whose sum is σ = 29655826848. Its totient is φ = 13180367424.

The previous prime is 21006210613. The next prime is 21006210653. The reversal of 21006210633 is 33601260012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21006210613) and next prime (21006210653).

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

It is not a de Polignac number, because 21006210633 - 2¹⁸ = 21005948489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21006210613) 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, 205943191 + ... + 205943292.

It is an arithmetic number, because the mean of its divisors is an integer number (3706978356).

Almost surely, 2^21006210633 is an apocalyptic number.

It is an amenable number.

21006210633 is a deficient number, since it is larger than the sum of its proper divisors (8649616215).

21006210633 is a wasteful number, since it uses less digits than its factorization.

21006210633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411886503.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21006210633 its reverse (33601260012), we get a palindrome (54607470645).

The spelling of 21006210633 in words is "twenty-one billion, six million, two hundred ten thousand, six hundred thirty-three".