2115421 has 16 divisors (see below), whose sum is σ = 2677248. Its totient is φ = 1623600.

The previous prime is 2115397. The next prime is 2115427. The reversal of 2115421 is 1245112.

2115421 = T₁₈₃ + T₁₈₄ + ... + T₂₆₅.

It is not a de Polignac number, because 2115421 - 2¹¹ = 2113373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2115395 and 2115404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115427) 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, 6226 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (167328).

2^2115421 is an apocalyptic number.

It is an amenable number.

2115421 is a deficient number, since it is larger than the sum of its proper divisors (561827).

2115421 is a wasteful number, since it uses less digits than its factorization.

2115421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its digits is 80, while the sum is 16.

The square root of 2115421 is about 1454.4486928043. The cubic root of 2115421 is about 128.3706096621.

The spelling of 2115421 in words is "two million, one hundred fifteen thousand, four hundred twenty-one".