21211011000121 has 4 divisors (see below), whose sum is σ = 21570519661200. Its totient is φ = 20851502339044.

The previous prime is 21211011000097. The next prime is 21211011000131. The reversal of 21211011000121 is 12100011011212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21211011000121 - 2³¹ = 21208863516473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211011000131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179754330451 + ... + 179754330568.

It is an arithmetic number, because the mean of its divisors is an integer number (5392629915300).

Almost surely, 2^{21211011000121} is an apocalyptic number.

It is an amenable number.

21211011000121 is a deficient number, since it is larger than the sum of its proper divisors (359508661079).

21211011000121 is an equidigital number, since it uses as much as digits as its factorization.

21211011000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359508661078.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211011000121 its reverse (12100011011212), we get a palindrome (33311022011333).

The spelling of 21211011000121 in words is "twenty-one trillion, two hundred eleven billion, eleven million, one hundred twenty-one", and thus it is an aban number.