21465011 has 8 divisors (see below), whose sum is σ = 21880320. Its totient is φ = 21053448.

The previous prime is 21464987. The next prime is 21465013. The reversal of 21465011 is 11056412.

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 21465011 - 2²² = 17270707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21465013) 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, 12380 + ... + 14006.

It is an arithmetic number, because the mean of its divisors is an integer number (2735040).

Almost surely, 2^21465011 is an apocalyptic number.

21465011 is a deficient number, since it is larger than the sum of its proper divisors (415309).

21465011 is a wasteful number, since it uses less digits than its factorization.

21465011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21465011 is about 4633.0347505712. The cubic root of 21465011 is about 277.9139659243.

The spelling of 21465011 in words is "twenty-one million, four hundred sixty-five thousand, eleven".