21221002112002 has 128 divisors (see below), whose sum is σ = 40729053173760. Its totient is φ = 8053594560000.

The previous prime is 21221002111987. The next prime is 21221002112027. The reversal of 21221002112002 is 20021120012212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 843060877 + ... + 843086047.

It is an arithmetic number, because the mean of its divisors is an integer number (318195727920).

Almost surely, 2^{21221002112002} is an apocalyptic number.

21221002112002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221002112002 is a deficient number, since it is larger than the sum of its proper divisors (19508051061758).

21221002112002 is a wasteful number, since it uses less digits than its factorization.

21221002112002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26168.

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

Adding to 21221002112002 its reverse (20021120012212), we get a palindrome (41242122124214).

The spelling of 21221002112002 in words is "twenty-one trillion, two hundred twenty-one billion, two million, one hundred twelve thousand, two".