2121020221001 has 32 divisors (see below), whose sum is σ = 2463847372800. Its totient is φ = 1804489523200.

The previous prime is 2121020220923. The next prime is 2121020221003. The reversal of 2121020221001 is 1001220201212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121020221001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121020221003) 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, 91030985 + ... + 91054281.

It is an arithmetic number, because the mean of its divisors is an integer number (76995230400).

Almost surely, 2^{2121020221001} is an apocalyptic number.

It is an amenable number.

2121020221001 is a deficient number, since it is larger than the sum of its proper divisors (342827151799).

2121020221001 is a wasteful number, since it uses less digits than its factorization.

2121020221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26065.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2121020221001 its reverse (1001220201212), we get a palindrome (3122240422213).

The spelling of 2121020221001 in words is "two trillion, one hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one".