21153005 has 8 divisors (see below), whose sum is σ = 26202624. Its totient is φ = 16376400.

The previous prime is 21152983. The next prime is 21153017. The reversal of 21153005 is 50035112.

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

It is not a de Polignac number, because 21153005 - 2¹⁰ = 21151981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68081 + ... + 68390.

It is an arithmetic number, because the mean of its divisors is an integer number (3275328).

Almost surely, 2^21153005 is an apocalyptic number.

It is an amenable number.

21153005 is a deficient number, since it is larger than the sum of its proper divisors (5049619).

21153005 is a wasteful number, since it uses less digits than its factorization.

21153005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136507.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 21153005 is about 4599.2396110662. The cubic root of 21153005 is about 276.5608432237.

Adding to 21153005 its reverse (50035112), we get a palindrome (71188117).

The spelling of 21153005 in words is "twenty-one million, one hundred fifty-three thousand, five".