21022212101 has 4 divisors (see below), whose sum is σ = 22933322304. Its totient is φ = 19111101900.

The previous prime is 21022212097. The next prime is 21022212103. The reversal of 21022212101 is 10121222012.

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 not a de Polignac number, because 21022212101 - 2² = 21022212097 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 (21022212103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955555085 + ... + 955555106.

It is an arithmetic number, because the mean of its divisors is an integer number (5733330576).

Almost surely, 2^21022212101 is an apocalyptic number.

It is an amenable number.

21022212101 is a deficient number, since it is larger than the sum of its proper divisors (1911110203).

21022212101 is a wasteful number, since it uses less digits than its factorization.

21022212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911110202.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022212101 its reverse (10121222012), we get a palindrome (31143434113).

The spelling of 21022212101 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand, one hundred one".