21212200122101 has 4 divisors (see below), whose sum is σ = 21213912038304. Its totient is φ = 21210488205900.

The previous prime is 21212200122083. The next prime is 21212200122103. The reversal of 21212200122101 is 10122100221212.

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 21212200122101 - 2¹⁸ = 21212199859957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212200122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212200122103) 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, 855939515 + ... + 855964296.

It is an arithmetic number, because the mean of its divisors is an integer number (5303478009576).

Almost surely, 2^{21212200122101} is an apocalyptic number.

It is an amenable number.

21212200122101 is a deficient number, since it is larger than the sum of its proper divisors (1711916203).

21212200122101 is a wasteful number, since it uses less digits than its factorization.

21212200122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711916202.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212200122101 its reverse (10122100221212), we get a palindrome (31334300343313).

The spelling of 21212200122101 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, one hundred twenty-two thousand, one hundred one".