21111112222002 has 144 divisors (see below), whose sum is σ = 53054000906400. Its totient is φ = 6015643130880.

The previous prime is 21111112221971. The next prime is 21111112222003. The reversal of 21111112222002 is 20022221111112.

21111112222002 is a `hidden beast` number, since 211 + 111 + 122 + 220 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21111112222003) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 64440249 + ... + 64767027.

It is an arithmetic number, because the mean of its divisors is an integer number (368430561850).

Almost surely, 2^{21111112222002} is an apocalyptic number.

21111112222002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111112222002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26527000453200).

21111112222002 is an abundant number, since it is smaller than the sum of its proper divisors (31942888684398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111112222002 is a wasteful number, since it uses less digits than its factorization.

21111112222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327961 (or 327941 counting only the distinct ones).

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

Adding to 21111112222002 its reverse (20022221111112), we get a palindrome (41133333333114).

The spelling of 21111112222002 in words is "twenty-one trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-two thousand, two".