2021420321 has 16 divisors (see below), whose sum is σ = 2162764800. Its totient is φ = 1885910208.

The previous prime is 2021420311. The next prime is 2021420399. The reversal of 2021420321 is 1230241202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021420321 is a prime.

It is a super-2 number, since 2×2021420321² = 8172280228303486082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021420321.

It is not an unprimeable number, because it can be changed into a prime (2021420311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98291 + ... + 117063.

It is an arithmetic number, because the mean of its divisors is an integer number (135172800).

Almost surely, 2^2021420321 is an apocalyptic number.

It is an amenable number.

2021420321 is a deficient number, since it is larger than the sum of its proper divisors (141344479).

2021420321 is a wasteful number, since it uses less digits than its factorization.

2021420321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18928.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2021420321 is about 44960.2081956923. The cubic root of 2021420321 is about 1264.4030722696.

Adding to 2021420321 its reverse (1230241202), we get a palindrome (3251661523).

The spelling of 2021420321 in words is "two billion, twenty-one million, four hundred twenty thousand, three hundred twenty-one".