23221221012 has 72 divisors (see below), whose sum is σ = 64058904000. Its totient is φ = 7034027520.

The previous prime is 23221220993. The next prime is 23221221017. The reversal of 23221221012 is 21012212232.

23221221012 is a `hidden beast` number, since 232 + 212 + 210 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221221017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1177828 + ... + 1197380.

It is an arithmetic number, because the mean of its divisors is an integer number (889707000).

Almost surely, 2^23221221012 is an apocalyptic number.

23221221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

23221221012 is an abundant number, since it is smaller than the sum of its proper divisors (40837682988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23221221012 is a wasteful number, since it uses less digits than its factorization.

23221221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22573 (or 22568 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 23221221012 its reverse (21012212232), we get a palindrome (44233433244).

The spelling of 23221221012 in words is "twenty-three billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".