21213033101 has 32 divisors (see below), whose sum is σ = 24320943360. Its totient is φ = 18352857600.

The previous prime is 21213033097. The next prime is 21213033133. The reversal of 21213033101 is 10133031212.

It is a cyclic number.

It is not a de Polignac number, because 21213033101 - 2² = 21213033097 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21213033101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213033161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5123090 + ... + 5127228.

It is an arithmetic number, because the mean of its divisors is an integer number (760029480).

Almost surely, 2^21213033101 is an apocalyptic number.

It is an amenable number.

21213033101 is a deficient number, since it is larger than the sum of its proper divisors (3107910259).

21213033101 is a wasteful number, since it uses less digits than its factorization.

21213033101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21213033101 its reverse (10133031212), we get a palindrome (31346064313).

The spelling of 21213033101 in words is "twenty-one billion, two hundred thirteen million, thirty-three thousand, one hundred one".