420011021 has 8 divisors (see below), whose sum is σ = 424116000. Its totient is φ = 415919920.

The previous prime is 420010967. The next prime is 420011069. The reversal of 420011021 is 120110024.

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

It is a cyclic number.

It is not a de Polignac number, because 420011021 - 2¹⁸ = 419748877 is a prime.

It is a super-2 number, since 2×420011021² = 352818515522924882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420010993 and 420011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420016021) 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, 63530 + ... + 69828.

It is an arithmetic number, because the mean of its divisors is an integer number (53014500).

Almost surely, 2^420011021 is an apocalyptic number.

It is an amenable number.

420011021 is a deficient number, since it is larger than the sum of its proper divisors (4104979).

420011021 is a wasteful number, since it uses less digits than its factorization.

420011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 420011021 is about 20494.1704150229. The cubic root of 420011021 is about 748.8937890505.

Adding to 420011021 its reverse (120110024), we get a palindrome (540121045).

The spelling of 420011021 in words is "four hundred twenty million, eleven thousand, twenty-one".