21355064 has 16 divisors (see below), whose sum is σ = 40251120. Its totient is φ = 10621440.

The previous prime is 21355057. The next prime is 21355091. The reversal of 21355064 is 46055312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5372 + ... + 8459.

It is an arithmetic number, because the mean of its divisors is an integer number (2515695).

Almost surely, 2^21355064 is an apocalyptic number.

It is an amenable number.

21355064 is a deficient number, since it is larger than the sum of its proper divisors (18896056).

21355064 is a wasteful number, since it uses less digits than its factorization.

21355064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14030 (or 14026 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 21355064 is about 4621.1539684369. The cubic root of 21355064 is about 277.4386478008.

The spelling of 21355064 in words is "twenty-one million, three hundred fifty-five thousand, sixty-four".