20606272421 has 4 divisors (see below), whose sum is σ = 23550025632. Its totient is φ = 17662519212.

The previous prime is 20606272381. The next prime is 20606272457. The reversal of 20606272421 is 12427260602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12427260602 = 2 ⋅6213630301.

It is a cyclic number.

It is not a de Polignac number, because 20606272421 - 2¹⁰ = 20606271397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606272481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1471876595 + ... + 1471876608.

It is an arithmetic number, because the mean of its divisors is an integer number (5887506408).

Almost surely, 2^20606272421 is an apocalyptic number.

It is an amenable number.

20606272421 is a deficient number, since it is larger than the sum of its proper divisors (2943753211).

20606272421 is an equidigital number, since it uses as much as digits as its factorization.

20606272421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943753210.

The product of its (nonzero) digits is 16128, while the sum is 32.

The spelling of 20606272421 in words is "twenty billion, six hundred six million, two hundred seventy-two thousand, four hundred twenty-one".