21426526 has 16 divisors (see below), whose sum is σ = 35322480. Its totient is φ = 9666880.

The previous prime is 21426521. The next prime is 21426541. The reversal of 21426526 is 62562412.

It is a junction number, because it is equal to n+sod(n) for n = 21426494 and 21426503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426521) 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, 541 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (2207655).

Almost surely, 2^21426526 is an apocalyptic number.

21426526 is a deficient number, since it is larger than the sum of its proper divisors (13895954).

21426526 is a wasteful number, since it uses less digits than its factorization.

21426526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259.

The product of its digits is 5760, while the sum is 28.

The square root of 21426526 is about 4628.8795620539. The cubic root of 21426526 is about 277.7477742645.

Adding to 21426526 its reverse (62562412), we get a palindrome (83988938).

It can be divided in two parts, 21426 and 526, that added together give a cube (21952 = 28³).

The spelling of 21426526 in words is "twenty-one million, four hundred twenty-six thousand, five hundred twenty-six".