26420721 has 16 divisors (see below), whose sum is σ = 37545984. Its totient is φ = 16487504.

The previous prime is 26420677. The next prime is 26420729. The reversal of 26420721 is 12702462.

It is not a de Polignac number, because 26420721 - 2⁶ = 26420657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26420691 and 26420700.

It is not an unprimeable number, because it can be changed into a prime (26420729) 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 15 ways as a sum of consecutive naturals, for example, 831 + ... + 7316.

It is an arithmetic number, because the mean of its divisors is an integer number (2346624).

Almost surely, 2^26420721 is an apocalyptic number.

It is an amenable number.

26420721 is a deficient number, since it is larger than the sum of its proper divisors (11125263).

26420721 is a wasteful number, since it uses less digits than its factorization.

26420721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8220.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 26420721 is about 5140.1090455359. The cubic root of 26420721 is about 297.8389930965.

The spelling of 26420721 in words is "twenty-six million, four hundred twenty thousand, seven hundred twenty-one".