21354607 has 4 divisors (see below), whose sum is σ = 21375760. Its totient is φ = 21333456.

The previous prime is 21354589. The next prime is 21354653. The reversal of 21354607 is 70645312.

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

It is a cyclic number.

It is not a de Polignac number, because 21354607 - 2¹¹ = 21352559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8982 + ... + 11107.

It is an arithmetic number, because the mean of its divisors is an integer number (5343940).

Almost surely, 2^21354607 is an apocalyptic number.

21354607 is a deficient number, since it is larger than the sum of its proper divisors (21153).

21354607 is a wasteful number, since it uses less digits than its factorization.

21354607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21152.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21354607 is about 4621.1045216485. The cubic root of 21354607 is about 277.4366687172.

Adding to 21354607 its reverse (70645312), we get a palindrome (91999919).

The spelling of 21354607 in words is "twenty-one million, three hundred fifty-four thousand, six hundred seven".