2002212121 has 24 divisors (see below), whose sum is σ = 2514882624. Its totient is φ = 1560461760.

The previous prime is 2002212109. The next prime is 2002212143. The reversal of 2002212121 is 1212122002.

It is a happy number.

It is not a de Polignac number, because 2002212121 - 2¹⁹ = 2001687833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

2002212121 is a modest number, since divided by 212121 gives 2002 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2002212151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66631 + ... + 91891.

It is an arithmetic number, because the mean of its divisors is an integer number (104786776).

Almost surely, 2^2002212121 is an apocalyptic number.

It is an amenable number.

2002212121 is a deficient number, since it is larger than the sum of its proper divisors (512670503).

2002212121 is a wasteful number, since it uses less digits than its factorization.

2002212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25361 (or 25348 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2002212121 is about 44746.0849795823. The cubic root of 2002212121 is about 1260.3853950411.

Adding to 2002212121 its reverse (1212122002), we get a palindrome (3214334123).

The spelling of 2002212121 in words is "two billion, two million, two hundred twelve thousand, one hundred twenty-one".