2012210021 has 4 divisors (see below), whose sum is σ = 2022745344. Its totient is φ = 2001674700.

The previous prime is 2012210017. The next prime is 2012210041. The reversal of 2012210021 is 1200122102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2012210021 - 2² = 2012210017 is a prime.

It is a super-2 number, since 2×2012210021² = 8097978337225640882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012209984 and 2012210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012210041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5267375 + ... + 5267756.

It is an arithmetic number, because the mean of its divisors is an integer number (505686336).

Almost surely, 2^2012210021 is an apocalyptic number.

It is an amenable number.

2012210021 is a deficient number, since it is larger than the sum of its proper divisors (10535323).

2012210021 is a wasteful number, since it uses less digits than its factorization.

2012210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10535322.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2012210021 is about 44857.6640163083. The cubic root of 2012210021 is about 1262.4797936314.

Adding to 2012210021 its reverse (1200122102), we get a palindrome (3212332123).

The spelling of 2012210021 in words is "two billion, twelve million, two hundred ten thousand, twenty-one".