2001212202121 has 16 divisors (see below), whose sum is σ = 2210012356608. Its totient is φ = 1796901965200.

The previous prime is 2001212202113. The next prime is 2001212202131. The reversal of 2001212202121 is 1212022121002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2001212202121 - 2³ = 2001212202113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001212202095 and 2001212202104.

It is not an unprimeable number, because it can be changed into a prime (2001212202131) 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, 3290520 + ... + 3850966.

It is an arithmetic number, because the mean of its divisors is an integer number (138125772288).

Almost surely, 2^{2001212202121} is an apocalyptic number.

It is an amenable number.

2001212202121 is a deficient number, since it is larger than the sum of its proper divisors (208800154487).

2001212202121 is a wasteful number, since it uses less digits than its factorization.

2001212202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564452.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001212202121 its reverse (1212022121002), we get a palindrome (3213234323123).

The spelling of 2001212202121 in words is "two trillion, one billion, two hundred twelve million, two hundred two thousand, one hundred twenty-one".