21560522401 has 4 divisors (see below), whose sum is σ = 23520569904. Its totient is φ = 19600474900.

The previous prime is 21560522341. The next prime is 21560522443. The reversal of 21560522401 is 10422506512.

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 21560522401 - 2⁹ = 21560521889 is a prime.

It is a super-2 number, since 2×21560522401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21560522401.

It is not an unprimeable number, because it can be changed into a prime (21560522201) 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, 980023735 + ... + 980023756.

It is an arithmetic number, because the mean of its divisors is an integer number (5880142476).

Almost surely, 2^21560522401 is an apocalyptic number.

It is an amenable number.

21560522401 is a deficient number, since it is larger than the sum of its proper divisors (1960047503).

21560522401 is a wasteful number, since it uses less digits than its factorization.

21560522401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960047502.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21560522401 in words is "twenty-one billion, five hundred sixty million, five hundred twenty-two thousand, four hundred one".