21120221012 has 24 divisors (see below), whose sum is σ = 41621083392. Its totient is φ = 9290419200.

The previous prime is 21120221011. The next prime is 21120221027. The reversal of 21120221012 is 21012202112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7740653 + ... + 7743380.

It is an arithmetic number, because the mean of its divisors is an integer number (1734211808).

Almost surely, 2^21120221012 is an apocalyptic number.

21120221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21120221012 is a deficient number, since it is larger than the sum of its proper divisors (20500862380).

21120221012 is a wasteful number, since it uses less digits than its factorization.

21120221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15484079 (or 15484077 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120221012 its reverse (21012202112), we get a palindrome (42132423124).

The spelling of 21120221012 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, twelve".