21041211633 has 8 divisors (see below), whose sum is σ = 30213021888. Its totient is φ = 12948437904.

The previous prime is 21041211623. The next prime is 21041211703. The reversal of 21041211633 is 33611214012.

It is a happy number.

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

It is not a de Polignac number, because 21041211633 - 2¹³ = 21041203441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21041211623) 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, 269759085 + ... + 269759162.

It is an arithmetic number, because the mean of its divisors is an integer number (3776627736).

Almost surely, 2^21041211633 is an apocalyptic number.

It is an amenable number.

21041211633 is a deficient number, since it is larger than the sum of its proper divisors (9171810255).

21041211633 is a wasteful number, since it uses less digits than its factorization.

21041211633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539518263.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21041211633 its reverse (33611214012), we get a palindrome (54652425645).

The spelling of 21041211633 in words is "twenty-one billion, forty-one million, two hundred eleven thousand, six hundred thirty-three".