21400526 has 8 divisors (see below), whose sum is σ = 36686640. Its totient is φ = 9171648.

The previous prime is 21400523. The next prime is 21400583. The reversal of 21400526 is 62500412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21400498 and 21400507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400523) 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 3 ways as a sum of consecutive naturals, for example, 764291 + ... + 764318.

It is an arithmetic number, because the mean of its divisors is an integer number (4585830).

Almost surely, 2^21400526 is an apocalyptic number.

21400526 is a deficient number, since it is larger than the sum of its proper divisors (15286114).

21400526 is a wasteful number, since it uses less digits than its factorization.

21400526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528618.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21400526 is about 4626.0702545465. The cubic root of 21400526 is about 277.6353845246.

Adding to 21400526 its reverse (62500412), we get a palindrome (83900938).

The spelling of 21400526 in words is "twenty-one million, four hundred thousand, five hundred twenty-six".