21121222002111 has 96 divisors (see below), whose sum is σ = 40083772385280. Its totient is φ = 10382808744000.

The previous prime is 21121222002103. The next prime is 21121222002113. The reversal of 21121222002111 is 11120022212112.

21121222002111 is a `hidden beast` number, since 21 + 1 + 212 + 220 + 0 + 211 + 1 = 666.

It is not a de Polignac number, because 21121222002111 - 2³ = 21121222002103 is a prime.

It is a super-2 number, since 2×21121222002111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121222002113) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10718136 + ... + 12534786.

It is an arithmetic number, because the mean of its divisors is an integer number (417539295680).

Almost surely, 2^{21121222002111} is an apocalyptic number.

21121222002111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21121222002111 is a deficient number, since it is larger than the sum of its proper divisors (18962550383169).

21121222002111 is a wasteful number, since it uses less digits than its factorization.

21121222002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817577 (or 1817574 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121222002111 its reverse (11120022212112), we get a palindrome (32241244214223).

The spelling of 21121222002111 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, two thousand, one hundred eleven".