21347534 has 16 divisors (see below), whose sum is σ = 34645968. Its totient is φ = 9806592.

The previous prime is 21347533. The next prime is 21347549. The reversal of 21347534 is 43574312.

It is a happy number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21347497 and 21347506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347533) 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, 4094 + ... + 7710.

It is an arithmetic number, because the mean of its divisors is an integer number (2165373).

Almost surely, 2^21347534 is an apocalyptic number.

21347534 is a deficient number, since it is larger than the sum of its proper divisors (13298434).

21347534 is a wasteful number, since it uses less digits than its factorization.

21347534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859.

The product of its digits is 10080, while the sum is 29.

The square root of 21347534 is about 4620.3391650397. The cubic root of 21347534 is about 277.4060347929.

The spelling of 21347534 in words is "twenty-one million, three hundred forty-seven thousand, five hundred thirty-four".