2001221000121 has 32 divisors (see below), whose sum is σ = 3248653040640. Its totient is φ = 1070315118144.

The previous prime is 2001221000113. The next prime is 2001221000131. The reversal of 2001221000121 is 1210001221002.

It is not a de Polignac number, because 2001221000121 - 2³ = 2001221000113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001221000097 and 2001221000106.

It is not an unprimeable number, because it can be changed into a prime (2001221000131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30181290 + ... + 30247523.

It is an arithmetic number, because the mean of its divisors is an integer number (101520407520).

Almost surely, 2^{2001221000121} is an apocalyptic number.

2001221000121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2001221000121 is a deficient number, since it is larger than the sum of its proper divisors (1247432040519).

2001221000121 is a wasteful number, since it uses less digits than its factorization.

2001221000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60428925.

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

Adding to 2001221000121 its reverse (1210001221002), we get a palindrome (3211222221123).

The spelling of 2001221000121 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.