21021112211 has 8 divisors (see below), whose sum is σ = 22953039984. Its totient is φ = 19092670720.

The previous prime is 21021112207. The next prime is 21021112219. The reversal of 21021112211 is 11221112012.

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 21021112211 - 2² = 21021112207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021112219) 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, 858950 + ... + 883083.

It is an arithmetic number, because the mean of its divisors is an integer number (2869129998).

Almost surely, 2^21021112211 is an apocalyptic number.

21021112211 is a deficient number, since it is larger than the sum of its proper divisors (1931927773).

21021112211 is a wasteful number, since it uses less digits than its factorization.

21021112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743141.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021112211 its reverse (11221112012), we get a palindrome (32242224223).

The spelling of 21021112211 in words is "twenty-one billion, twenty-one million, one hundred twelve thousand, two hundred eleven".