21221201102002 has 64 divisors (see below), whose sum is σ = 37382039861760. Its totient is φ = 8933204966400.

The previous prime is 21221201101987. The next prime is 21221201102027. The reversal of 21221201102002 is 20020110212212.

It is a happy number.

It is a super-2 number, since 2×21221201102002² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 776658 + ... + 6560914.

It is an arithmetic number, because the mean of its divisors is an integer number (584094372840).

Almost surely, 2^{21221201102002} is an apocalyptic number.

21221201102002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221201102002 is a deficient number, since it is larger than the sum of its proper divisors (16160838759758).

21221201102002 is a wasteful number, since it uses less digits than its factorization.

21221201102002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784487.

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

Adding to 21221201102002 its reverse (20020110212212), we get a palindrome (41241311314214).

The spelling of 21221201102002 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, one hundred two thousand, two".