21454685 has 16 divisors (see below), whose sum is σ = 30143232. Its totient is φ = 14352000.

The previous prime is 21454681. The next prime is 21454687. The reversal of 21454685 is 58645412.

It is not a de Polignac number, because 21454685 - 2² = 21454681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6041 + ... + 8910.

It is an arithmetic number, because the mean of its divisors is an integer number (1883952).

Almost surely, 2^21454685 is an apocalyptic number.

It is an amenable number.

21454685 is a deficient number, since it is larger than the sum of its proper divisors (8688547).

21454685 is a wasteful number, since it uses less digits than its factorization.

21454685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15004.

The product of its digits is 38400, while the sum is 35.

The square root of 21454685 is about 4631.9202281559. The cubic root of 21454685 is about 277.8693941650.

The spelling of 21454685 in words is "twenty-one million, four hundred fifty-four thousand, six hundred eighty-five".