21222001212011 has 4 divisors (see below), whose sum is σ = 21241453093224. Its totient is φ = 21202549330800.

The previous prime is 21222001211977. The next prime is 21222001212059. The reversal of 21222001212011 is 11021210022212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222001212011 - 2⁶ = 21222001211947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222001211011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9725938970 + ... + 9725941151.

It is an arithmetic number, because the mean of its divisors is an integer number (5310363273306).

Almost surely, 2^{21222001212011} is an apocalyptic number.

21222001212011 is a deficient number, since it is larger than the sum of its proper divisors (19451881213).

21222001212011 is a wasteful number, since it uses less digits than its factorization.

21222001212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19451881212.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222001212011 its reverse (11021210022212), we get a palindrome (32243211234223).

The spelling of 21222001212011 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred twelve thousand, eleven".