21211221000001 has 16 divisors (see below), whose sum is σ = 22840077427200. Its totient is φ = 19624727340288.

The previous prime is 21211220999987. The next prime is 21211221000037. The reversal of 21211221000001 is 10000012211212.

It is a cyclic number.

It is not a de Polignac number, because 21211221000001 - 2²¹ = 21211218902849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211221000041) 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, 54528871 + ... + 54916483.

It is an arithmetic number, because the mean of its divisors is an integer number (1427504839200).

Almost surely, 2^{21211221000001} is an apocalyptic number.

It is an amenable number.

21211221000001 is a deficient number, since it is larger than the sum of its proper divisors (1628856427199).

21211221000001 is a wasteful number, since it uses less digits than its factorization.

21211221000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442248.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211221000001 its reverse (10000012211212), we get a palindrome (31211233211213).

The spelling of 21211221000001 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, one", and thus it is an aban number.