21010100222121 has 4 divisors (see below), whose sum is σ = 28013466962832. Its totient is φ = 14006733481412.

The previous prime is 21010100222099. The next prime is 21010100222129. The reversal of 21010100222121 is 12122200101012.

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 21010100222121 - 2⁶ = 21010100222057 is a prime.

It is a super-2 number, since 2×21010100222121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21010100222121.

It is not an unprimeable number, because it can be changed into a prime (21010100222129) 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, 3501683370351 + ... + 3501683370356.

It is an arithmetic number, because the mean of its divisors is an integer number (7003366740708).

Almost surely, 2^{21010100222121} is an apocalyptic number.

It is an amenable number.

21010100222121 is a deficient number, since it is larger than the sum of its proper divisors (7003366740711).

21010100222121 is an equidigital number, since it uses as much as digits as its factorization.

21010100222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003366740710.

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

Adding to 21010100222121 its reverse (12122200101012), we get a palindrome (33132300323133).

The spelling of 21010100222121 in words is "twenty-one trillion, ten billion, one hundred million, two hundred twenty-two thousand, one hundred twenty-one".