21220121012001 has 16 divisors (see below), whose sum is σ = 28692197987328. Its totient is φ = 13947398514000.

The previous prime is 21220121011997. The next prime is 21220121012003. The reversal of 21220121012001 is 10021012102212.

It is not a de Polignac number, because 21220121012001 - 2² = 21220121011997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220121012003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41242476 + ... + 41753826.

It is an arithmetic number, because the mean of its divisors is an integer number (1793262374208).

Almost surely, 2^{21220121012001} is an apocalyptic number.

It is an amenable number.

21220121012001 is a deficient number, since it is larger than the sum of its proper divisors (7472076975327).

21220121012001 is a wasteful number, since it uses less digits than its factorization.

21220121012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706252.

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

Adding to 21220121012001 its reverse (10021012102212), we get a palindrome (31241133114213).

The spelling of 21220121012001 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twelve thousand, one".