21220212001111 has 4 divisors (see below), whose sum is σ = 21224983809472. Its totient is φ = 21215440192752.

The previous prime is 21220212001097. The next prime is 21220212001127. The reversal of 21220212001111 is 11110021202212.

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 21220212001111 - 2⁹ = 21220212000599 is a prime.

It is a super-2 number, since 2×21220212001111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220212001171) 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, 2385897510 + ... + 2385906403.

It is an arithmetic number, because the mean of its divisors is an integer number (5306245952368).

Almost surely, 2^{21220212001111} is an apocalyptic number.

21220212001111 is a deficient number, since it is larger than the sum of its proper divisors (4771808361).

21220212001111 is an equidigital number, since it uses as much as digits as its factorization.

21220212001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771808360.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220212001111 its reverse (11110021202212), we get a palindrome (32330233203323).

The spelling of 21220212001111 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, one thousand, one hundred eleven".