21012122222101 has 4 divisors (see below), whose sum is σ = 21095835856704. Its totient is φ = 20928408587500.

The previous prime is 21012122222099. The next prime is 21012122222183. The reversal of 21012122222101 is 10122222121012.

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 21012122222101 - 2¹ = 21012122222099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012122226101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41856816925 + ... + 41856817426.

It is an arithmetic number, because the mean of its divisors is an integer number (5273958964176).

Almost surely, 2^{21012122222101} is an apocalyptic number.

It is an amenable number.

21012122222101 is a deficient number, since it is larger than the sum of its proper divisors (83713634603).

21012122222101 is an equidigital number, since it uses as much as digits as its factorization.

21012122222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83713634602.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012122222101 its reverse (10122222121012), we get a palindrome (31134344343113).

The spelling of 21012122222101 in words is "twenty-one trillion, twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred one".