21004424153 has 8 divisors (see below), whose sum is σ = 21030004608. Its totient is φ = 20978861904.

The previous prime is 21004424131. The next prime is 21004424179. The reversal of 21004424153 is 35142440012.

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

It is a cyclic number.

It is not a de Polignac number, because 21004424153 - 2¹⁴ = 21004407769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004424053) 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, 4948250 + ... + 4952492.

It is an arithmetic number, because the mean of its divisors is an integer number (2628750576).

Almost surely, 2^21004424153 is an apocalyptic number.

It is an amenable number.

21004424153 is a deficient number, since it is larger than the sum of its proper divisors (25580455).

21004424153 is a wasteful number, since it uses less digits than its factorization.

21004424153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9103.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21004424153 its reverse (35142440012), we get a palindrome (56146864165).

The spelling of 21004424153 in words is "twenty-one billion, four million, four hundred twenty-four thousand, one hundred fifty-three".