21102422213 has 4 divisors (see below), whose sum is σ = 21104455308. Its totient is φ = 21100389120.

The previous prime is 21102422197. The next prime is 21102422227. The reversal of 21102422213 is 31222420112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7651525729 + 13450896484 = 87473^2 + 115978^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102422213 - 2⁴ = 21102422197 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 (21102422273) 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, 1000898 + ... + 1021763.

It is an arithmetic number, because the mean of its divisors is an integer number (5276113827).

Almost surely, 2^21102422213 is an apocalyptic number.

It is an amenable number.

21102422213 is a deficient number, since it is larger than the sum of its proper divisors (2033095).

21102422213 is a wasteful number, since it uses less digits than its factorization.

21102422213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033094.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21102422213 its reverse (31222420112), we get a palindrome (52324842325).

The spelling of 21102422213 in words is "twenty-one billion, one hundred two million, four hundred twenty-two thousand, two hundred thirteen".