21324127601 has 32 divisors (see below), whose sum is σ = 25419760128. Its totient is φ = 17507197440.

The previous prime is 21324127567. The next prime is 21324127607. The reversal of 21324127601 is 10672142312.

It is a cyclic number.

It is not a de Polignac number, because 21324127601 - 2¹⁸ = 21323865457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21324127607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20059796 + ... + 20060858.

It is an arithmetic number, because the mean of its divisors is an integer number (794367504).

Almost surely, 2^21324127601 is an apocalyptic number.

It is an amenable number.

21324127601 is a deficient number, since it is larger than the sum of its proper divisors (4095632527).

21324127601 is a wasteful number, since it uses less digits than its factorization.

21324127601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 21324127601 its reverse (10672142312), we get a palindrome (31996269913).

The spelling of 21324127601 in words is "twenty-one billion, three hundred twenty-four million, one hundred twenty-seven thousand, six hundred one".