12210021021 has 16 divisors (see below), whose sum is σ = 17974010880. Its totient is φ = 7310854320.

The previous prime is 12210021013. The next prime is 12210021029. The reversal of 12210021021 is 12012001221.

It is an interprime number because it is at equal distance from previous prime (12210021013) and next prime (12210021029).

It is not a de Polignac number, because 12210021021 - 2³ = 12210021013 is a prime.

It is a super-2 number, since 2×12210021021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12210020988 and 12210021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210021029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2226181 + ... + 2231658.

It is an arithmetic number, because the mean of its divisors is an integer number (1123375680).

Almost surely, 2^12210021021 is an apocalyptic number.

12210021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12210021021 is a deficient number, since it is larger than the sum of its proper divisors (5763989859).

12210021021 is a wasteful number, since it uses less digits than its factorization.

12210021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457936.

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

Adding to 12210021021 its reverse (12012001221), we get a palindrome (24222022242).

The spelling of 12210021021 in words is "twelve billion, two hundred ten million, twenty-one thousand, twenty-one".