11121222210021 has 48 divisors (see below), whose sum is σ = 20028148553088. Its totient is φ = 5777166038400.

The previous prime is 11121222209989. The next prime is 11121222210037. The reversal of 11121222210021 is 12001222212111.

11121222210021 is a `hidden beast` number, since 111 + 212 + 222 + 100 + 21 = 666.

It is not a de Polignac number, because 11121222210021 - 2⁵ = 11121222209989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121222209976 and 11121222210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121222210121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75405811 + ... + 75553151.

It is an arithmetic number, because the mean of its divisors is an integer number (417253094856).

Almost surely, 2^{11121222210021} is an apocalyptic number.

11121222210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121222210021 is a deficient number, since it is larger than the sum of its proper divisors (8906926343067).

11121222210021 is a wasteful number, since it uses less digits than its factorization.

11121222210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256282 (or 256279 counting only the distinct ones).

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

Adding to 11121222210021 its reverse (12001222212111), we get a palindrome (23122444422132).

The spelling of 11121222210021 in words is "eleven trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, twenty-one".