420888021 has 8 divisors (see below), whose sum is σ = 561280800. Its totient is φ = 280543632.

The previous prime is 420888011. The next prime is 420888029. The reversal of 420888021 is 120888024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420888021 - 2¹⁴ = 420871637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420888029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21655 + ... + 36203.

It is an arithmetic number, because the mean of its divisors is an integer number (70160100).

Almost surely, 2^420888021 is an apocalyptic number.

It is an amenable number.

420888021 is a deficient number, since it is larger than the sum of its proper divisors (140392779).

420888021 is a wasteful number, since it uses less digits than its factorization.

420888021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24195.

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 420888021 is about 20515.5555859450. Note that the first 4 decimals coincide. The cubic root of 420888021 is about 749.4146668545.

It can be divided in two parts, 4208 and 88021, that added together give a palindrome (92229).

The spelling of 420888021 in words is "four hundred twenty million, eight hundred eighty-eight thousand, twenty-one".