21101423212 has 24 divisors (see below), whose sum is σ = 37021743360. Its totient is φ = 10523809920.

The previous prime is 21101423191. The next prime is 21101423221. The reversal of 21101423212 is 21232410112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101423212.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5998078 + ... + 6001594.

It is an arithmetic number, because the mean of its divisors is an integer number (1542572640).

Almost surely, 2^21101423212 is an apocalyptic number.

It is an amenable number.

21101423212 is a deficient number, since it is larger than the sum of its proper divisors (15920320148).

21101423212 is a wasteful number, since it uses less digits than its factorization.

21101423212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6921 (or 6919 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21101423212 its reverse (21232410112), we get a palindrome (42333833324).

The spelling of 21101423212 in words is "twenty-one billion, one hundred one million, four hundred twenty-three thousand, two hundred twelve".