21122201021111 has 8 divisors (see below), whose sum is σ = 21206877326400. Its totient is φ = 21037685852160.

The previous prime is 21122201021107. The next prime is 21122201021113. The reversal of 21122201021111 is 11112010222112.

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 21122201021111 - 2² = 21122201021107 is a prime.

It is a super-2 number, since 2×21122201021111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122201021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122201021113) 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, 40021391 + ... + 40545728.

It is an arithmetic number, because the mean of its divisors is an integer number (2650859665800).

Almost surely, 2^{21122201021111} is an apocalyptic number.

21122201021111 is a deficient number, since it is larger than the sum of its proper divisors (84676305289).

21122201021111 is an equidigital number, since it uses as much as digits as its factorization.

21122201021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80568169.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21122201021111 its reverse (11112010222112), we get a palindrome (32234211243223).

The spelling of 21122201021111 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred one million, twenty-one thousand, one hundred eleven".