21320221012012 has 24 divisors (see below), whose sum is σ = 40180743819216. Its totient is φ = 9840021851328.

The previous prime is 21320221012003. The next prime is 21320221012021. The reversal of 21320221012012 is 21021012202312.

It is an interprime number because it is at equal distance from previous prime (21320221012003) and next prime (21320221012021).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5031378 + ... + 8243494.

It is an arithmetic number, because the mean of its divisors is an integer number (1674197659134).

Almost surely, 2^{21320221012012} is an apocalyptic number.

It is an amenable number.

21320221012012 is a deficient number, since it is larger than the sum of its proper divisors (18860522807204).

21320221012012 is a wasteful number, since it uses less digits than its factorization.

21320221012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339777 (or 3339775 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21320221012012 its reverse (21021012202312), we get a palindrome (42341233214324).

The spelling of 21320221012012 in words is "twenty-one trillion, three hundred twenty billion, two hundred twenty-one million, twelve thousand, twelve".