12201210021 has 96 divisors (see below), whose sum is σ = 22558998528. Its totient is φ = 5691928320.

The previous prime is 12201210019. The next prime is 12201210067. The reversal of 12201210021 is 12001210221.

It is not a de Polignac number, because 12201210021 - 2¹ = 12201210019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12201209979 and 12201210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201210001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1440220 + ... + 1448666.

It is an arithmetic number, because the mean of its divisors is an integer number (234989568).

Almost surely, 2^12201210021 is an apocalyptic number.

12201210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12201210021 is a deficient number, since it is larger than the sum of its proper divisors (10357788507).

12201210021 is a wasteful number, since it uses less digits than its factorization.

12201210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8531 (or 8518 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12201210021 its reverse (12001210221), we get a palindrome (24202420242).

It can be divided in two parts, 12201 and 210021, that added together give a palindrome (222222).

The spelling of 12201210021 in words is "twelve billion, two hundred one million, two hundred ten thousand, twenty-one".