21022212011 has 16 divisors (see below), whose sum is σ = 21508841184. Its totient is φ = 20541579264.

The previous prime is 21022211999. The next prime is 21022212017. The reversal of 21022212011 is 11021222012.

It is a cyclic number.

It is not a de Polignac number, because 21022212011 - 2¹⁰ = 21022210987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022212017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5768756 + ... + 5772398.

It is an arithmetic number, because the mean of its divisors is an integer number (1344302574).

Almost surely, 2^21022212011 is an apocalyptic number.

21022212011 is a deficient number, since it is larger than the sum of its proper divisors (486629173).

21022212011 is a wasteful number, since it uses less digits than its factorization.

21022212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022212011 its reverse (11021222012), we get a palindrome (32043434023).

The spelling of 21022212011 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand, eleven".