21112222101 has 4 divisors (see below), whose sum is σ = 28149629472. Its totient is φ = 14074814732.

The previous prime is 21112222081. The next prime is 21112222121. The reversal of 21112222101 is 10122221112.

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 an interprime number because it is at equal distance from previous prime (21112222081) and next prime (21112222121).

It is a cyclic number.

It is not a de Polignac number, because 21112222101 - 2⁵ = 21112222069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112222121) 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, 3518703681 + ... + 3518703686.

It is an arithmetic number, because the mean of its divisors is an integer number (7037407368).

Almost surely, 2^21112222101 is an apocalyptic number.

It is an amenable number.

21112222101 is a deficient number, since it is larger than the sum of its proper divisors (7037407371).

21112222101 is an equidigital number, since it uses as much as digits as its factorization.

21112222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037407370.

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

Adding to 21112222101 its reverse (10122221112), we get a palindrome (31234443213).

The spelling of 21112222101 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, one hundred one".