2021421 has 8 divisors (see below), whose sum is σ = 2768224. Its totient is φ = 1311120.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021421 is 1241202.

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

It is not a de Polignac number, because 2021421 - 2¹³ = 2013229 is a prime.

It is a super-2 number, since 2×2021421² = 8172285718482, which contains 22 as substring.

It is a Duffinian number.

2021421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2021397 and 2021406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021431) 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, 8995 + ... + 9216.

It is an arithmetic number, because the mean of its divisors is an integer number (346028).

2^2021421 is an apocalyptic number.

It is an amenable number.

2021421 is a deficient number, since it is larger than the sum of its proper divisors (746803).

2021421 is a wasteful number, since it uses less digits than its factorization.

2021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18251.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2021421 is about 1421.7668585250. The cubic root of 2021421 is about 126.4403213842.

Adding to 2021421 its reverse (1241202), we get a palindrome (3262623).

It can be divided in two parts, 2021 and 421, that added together give a palindrome (2442).

The spelling of 2021421 in words is "two million, twenty-one thousand, four hundred twenty-one".