2001221220212 has 24 divisors (see below), whose sum is σ = 3554529573504. Its totient is φ = 985642365312.

The previous prime is 2001221220169. The next prime is 2001221220241. The reversal of 2001221220212 is 2120221221002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8898293 + ... + 9120419.

It is an arithmetic number, because the mean of its divisors is an integer number (148105398896).

Almost surely, 2^{2001221220212} is an apocalyptic number.

It is an amenable number.

2001221220212 is a deficient number, since it is larger than the sum of its proper divisors (1553308353292).

2001221220212 is a wasteful number, since it uses less digits than its factorization.

2001221220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255815 (or 255813 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2001221220212 its reverse (2120221221002), we get a palindrome (4121442441214).

The spelling of 2001221220212 in words is "two trillion, one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".