10001222001221 has 8 divisors (see below), whose sum is σ = 10910464581600. Its totient is φ = 9091986184240.

The previous prime is 10001222001109. The next prime is 10001222001233. The reversal of 10001222001221 is 12210022210001.

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

It is a cyclic number.

It is not a de Polignac number, because 10001222001221 - 2²⁶ = 10001154892357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001222001196 and 10001222001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001222006221) 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, 1696010 + ... + 4783188.

It is an arithmetic number, because the mean of its divisors is an integer number (1363808072700).

Almost surely, 2^{10001222001221} is an apocalyptic number.

10001222001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10001222001221 is a deficient number, since it is larger than the sum of its proper divisors (909242580379).

10001222001221 is a wasteful number, since it uses less digits than its factorization.

10001222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381699.

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

Adding to 10001222001221 its reverse (12210022210001), we get a palindrome (22211244211222).

It can be divided in two parts, 1000 and 1222001221, that added together give a palindrome (1222002221).

The spelling of 10001222001221 in words is "ten trillion, one billion, two hundred twenty-two million, one thousand, two hundred twenty-one".