2001211012221 has 8 divisors (see below), whose sum is σ = 2668396737600. Its totient is φ = 1334082980832.

The previous prime is 2001211012153. The next prime is 2001211012237. The reversal of 2001211012221 is 1222101121002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001211012221 - 2¹⁹ = 2001210487933 is a prime.

It is a super-2 number, since 2×2001211012221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001211012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001211014221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14342496 + ... + 14481353.

It is an arithmetic number, because the mean of its divisors is an integer number (333549592200).

Almost surely, 2^{2001211012221} is an apocalyptic number.

It is an amenable number.

2001211012221 is a deficient number, since it is larger than the sum of its proper divisors (667185725379).

2001211012221 is a wasteful number, since it uses less digits than its factorization.

2001211012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28846995.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001211012221 its reverse (1222101121002), we get a palindrome (3223312133223).

The spelling of 2001211012221 in words is "two trillion, one billion, two hundred eleven million, twelve thousand, two hundred twenty-one".