21323421101 has 4 divisors (see below), whose sum is σ = 21324626400. Its totient is φ = 21322215804.

The previous prime is 21323421043. The next prime is 21323421121. The reversal of 21323421101 is 10112432312.

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 21323421101 - 2¹⁰ = 21323420077 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 (21323421121) 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, 575711 + ... + 611628.

It is an arithmetic number, because the mean of its divisors is an integer number (5331156600).

Almost surely, 2^21323421101 is an apocalyptic number.

It is an amenable number.

21323421101 is a deficient number, since it is larger than the sum of its proper divisors (1205299).

21323421101 is a wasteful number, since it uses less digits than its factorization.

21323421101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205298.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21323421101 its reverse (10112432312), we get a palindrome (31435853413).

The spelling of 21323421101 in words is "twenty-one billion, three hundred twenty-three million, four hundred twenty-one thousand, one hundred one".