21323344401 has 12 divisors (see below), whose sum is σ = 30815171712. Its totient is φ = 14208738936.

The previous prime is 21323344397. The next prime is 21323344423. The reversal of 21323344401 is 10444332312.

21323344401 is a `hidden beast` number, since 21 + 3 + 233 + 4 + 4 + 401 = 666.

It is not a de Polignac number, because 21323344401 - 2² = 21323344397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21323344201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 548841 + ... + 586406.

It is an arithmetic number, because the mean of its divisors is an integer number (2567930976).

Almost surely, 2^21323344401 is an apocalyptic number.

It is an amenable number.

21323344401 is a deficient number, since it is larger than the sum of its proper divisors (9491827311).

21323344401 is a wasteful number, since it uses less digits than its factorization.

21323344401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137340 (or 1137337 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21323344401 its reverse (10444332312), we get a palindrome (31767676713).

The spelling of 21323344401 in words is "twenty-one billion, three hundred twenty-three million, three hundred forty-four thousand, four hundred one".