21322246401 has 12 divisors (see below), whose sum is σ = 30817014228. Its totient is φ = 14206424544.

The previous prime is 21322246357. The next prime is 21322246411. The reversal of 21322246401 is 10464222312.

21322246401 is a `hidden beast` number, since 2 + 1 + 32 + 224 + 6 + 401 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11853983376 + 9468263025 = 108876^2 + 97305^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21322246401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21322246411) 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, 684450 + ... + 714923.

It is an arithmetic number, because the mean of its divisors is an integer number (2568084519).

Almost surely, 2^21322246401 is an apocalyptic number.

It is an amenable number.

21322246401 is a deficient number, since it is larger than the sum of its proper divisors (9494767827).

21322246401 is a wasteful number, since it uses less digits than its factorization.

21322246401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401072 (or 1401069 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21322246401 its reverse (10464222312), we get a palindrome (31786468713).

The spelling of 21322246401 in words is "twenty-one billion, three hundred twenty-two million, two hundred forty-six thousand, four hundred one".