20466537225221 has 4 divisors (see below), whose sum is σ = 20495002507200. Its totient is φ = 20438071943244.

The previous prime is 20466537225091. The next prime is 20466537225227. The reversal of 20466537225221 is 12252273566402.

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 a de Polignac number, because none of the positive numbers 2^k-20466537225221 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 (20466537225227) 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, 14232639911 + ... + 14232641348.

It is an arithmetic number, because the mean of its divisors is an integer number (5123750626800).

Almost surely, 2^{20466537225221} is an apocalyptic number.

It is an amenable number.

20466537225221 is a deficient number, since it is larger than the sum of its proper divisors (28465281979).

20466537225221 is an equidigital number, since it uses as much as digits as its factorization.

20466537225221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28465281978.

The product of its (nonzero) digits is 2419200, while the sum is 47.

The spelling of 20466537225221 in words is "twenty trillion, four hundred sixty-six billion, five hundred thirty-seven million, two hundred twenty-five thousand, two hundred twenty-one".