21221200112002 has 32 divisors (see below), whose sum is σ = 34762621452480. Its totient is φ = 9635718742080.

The previous prime is 21221200111999. The next prime is 21221200112003. The reversal of 21221200112002 is 20021100212212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21221200112003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193662993 + ... + 193772539.

It is an arithmetic number, because the mean of its divisors is an integer number (1086331920390).

Almost surely, 2^{21221200112002} is an apocalyptic number.

21221200112002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221200112002 is a deficient number, since it is larger than the sum of its proper divisors (13541421340478).

21221200112002 is a wasteful number, since it uses less digits than its factorization.

21221200112002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118866.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221200112002 its reverse (20021100212212), we get a palindrome (41242300324214).

The spelling of 21221200112002 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred twelve thousand, two".