21012212211 has 8 divisors (see below), whose sum is σ = 29664299664. Its totient is φ = 13184133120.

The previous prime is 21012212203. The next prime is 21012212227. The reversal of 21012212211 is 11221221012.

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

It is not a de Polignac number, because 21012212211 - 2³ = 21012212203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012212231) 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, 206002030 + ... + 206002131.

It is an arithmetic number, because the mean of its divisors is an integer number (3708037458).

Almost surely, 2^21012212211 is an apocalyptic number.

21012212211 is a deficient number, since it is larger than the sum of its proper divisors (8652087453).

21012212211 is a wasteful number, since it uses less digits than its factorization.

21012212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412004181.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012212211 its reverse (11221221012), we get a palindrome (32233433223).

The spelling of 21012212211 in words is "twenty-one billion, twelve million, two hundred twelve thousand, two hundred eleven".