21212320221002 has 16 divisors (see below), whose sum is σ = 31826140503552. Its totient is φ = 10603606916640.

The previous prime is 21212320220921. The next prime is 21212320221013. The reversal of 21212320221002 is 20012202321212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374529278 + ... + 374585910.

It is an arithmetic number, because the mean of its divisors is an integer number (1989133781472).

Almost surely, 2^{21212320221002} is an apocalyptic number.

21212320221002 is a deficient number, since it is larger than the sum of its proper divisors (10613820282550).

21212320221002 is a wasteful number, since it uses less digits than its factorization.

21212320221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98413.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21212320221002 its reverse (20012202321212), we get a palindrome (41224522542214).

The spelling of 21212320221002 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty million, two hundred twenty-one thousand, two".