26421021 has 24 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 15494400.

The previous prime is 26421019. The next prime is 26421029. The reversal of 26421021 is 12012462.

26421021 is a `hidden beast` number, since 2 + 642 + 1 + 0 + 21 = 666.

It is not a de Polignac number, because 26421021 - 2¹ = 26421019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26420985 and 26421003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26421029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1236 + ... + 7373.

It is an arithmetic number, because the mean of its divisors is an integer number (1790880).

Almost surely, 2^26421021 is an apocalyptic number.

It is an amenable number.

26421021 is a deficient number, since it is larger than the sum of its proper divisors (16560099).

26421021 is a wasteful number, since it uses less digits than its factorization.

26421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8657 (or 8654 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 26421021 is about 5140.1382277133. The cubic root of 26421021 is about 297.8401203854.

Adding to 26421021 its reverse (12012462), we get a palindrome (38433483).

It can be divided in two parts, 2642 and 1021, that added together give a palindrome (3663).

The spelling of 26421021 in words is "twenty-six million, four hundred twenty-one thousand, twenty-one".