21354526 has 4 divisors (see below), whose sum is σ = 32031792. Its totient is φ = 10677262.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354526 is 62545312.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21354494 and 21354503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338630 + ... + 5338633.

It is an arithmetic number, because the mean of its divisors is an integer number (8007948).

Almost surely, 2^21354526 is an apocalyptic number.

21354526 is a deficient number, since it is larger than the sum of its proper divisors (10677266).

21354526 is a wasteful number, since it uses less digits than its factorization.

21354526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677265.

The product of its digits is 7200, while the sum is 28.

The square root of 21354526 is about 4621.0957575017. The cubic root of 21354526 is about 277.4363179358.

Adding to 21354526 its reverse (62545312), we get a palindrome (83899838).

The spelling of 21354526 in words is "twenty-one million, three hundred fifty-four thousand, five hundred twenty-six".