21101211233 has 8 divisors (see below), whose sum is σ = 21547902528. Its totient is φ = 20656318384.

The previous prime is 21101211221. The next prime is 21101211239. The reversal of 21101211233 is 33211210112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101211233 is a prime.

It is a super-2 number, since 2×21101211233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101211239) 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, 425885 + ... + 472842.

It is an arithmetic number, because the mean of its divisors is an integer number (2693487816).

Almost surely, 2^21101211233 is an apocalyptic number.

It is an amenable number.

21101211233 is a deficient number, since it is larger than the sum of its proper divisors (446691295).

21101211233 is an equidigital number, since it uses as much as digits as its factorization.

21101211233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899223.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21101211233 its reverse (33211210112), we get a palindrome (54312421345).

The spelling of 21101211233 in words is "twenty-one billion, one hundred one million, two hundred eleven thousand, two hundred thirty-three".