2002210121 has 4 divisors (see below), whose sum is σ = 2002320144. Its totient is φ = 2002100100.

The previous prime is 2002210117. The next prime is 2002210123. The reversal of 2002210121 is 1210122002.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1210122002 = 2 ⋅605061001.

It is a cyclic number.

It is not a de Polignac number, because 2002210121 - 2² = 2002210117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002210123) 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, 20495 + ... + 66516.

It is an arithmetic number, because the mean of its divisors is an integer number (500580036).

Almost surely, 2^2002210121 is an apocalyptic number.

It is an amenable number.

2002210121 is a deficient number, since it is larger than the sum of its proper divisors (110023).

2002210121 is an equidigital number, since it uses as much as digits as its factorization.

2002210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110022.

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

The square root of 2002210121 is about 44746.0626312528. The cubic root of 2002210121 is about 1260.3849753767.

Adding to 2002210121 its reverse (1210122002), we get a palindrome (3212332123).

The spelling of 2002210121 in words is "two billion, two million, two hundred ten thousand, one hundred twenty-one".