427620021 has 4 divisors (see below), whose sum is σ = 570160032. Its totient is φ = 285080012.

The previous prime is 427620019. The next prime is 427620041. The reversal of 427620021 is 120026724.

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 427620021 - 2¹ = 427620019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 427619973 and 427620000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427620041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71270001 + ... + 71270006.

It is an arithmetic number, because the mean of its divisors is an integer number (142540008).

Almost surely, 2^427620021 is an apocalyptic number.

It is an amenable number.

427620021 is a deficient number, since it is larger than the sum of its proper divisors (142540011).

427620021 is a wasteful number, since it uses less digits than its factorization.

427620021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142540010.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 427620021 is about 20678.9753372840. The cubic root of 427620021 is about 753.3891189839.

Adding to 427620021 its reverse (120026724), we get a palindrome (547646745).

The spelling of 427620021 in words is "four hundred twenty-seven million, six hundred twenty thousand, twenty-one".