21673854 has 12 divisors (see below), whose sum is σ = 46960056. Its totient is φ = 7224612.

The previous prime is 21673837. The next prime is 21673859. The reversal of 21673854 is 45837612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602034 + ... + 602069.

It is an arithmetic number, because the mean of its divisors is an integer number (3913338).

Almost surely, 2^21673854 is an apocalyptic number.

21673854 is an abundant number, since it is smaller than the sum of its proper divisors (25286202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21673854 is a wasteful number, since it uses less digits than its factorization.

21673854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204111 (or 1204108 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21673854 is about 4655.5186606865. The cubic root of 21673854 is about 278.8123762626.

The spelling of 21673854 in words is "twenty-one million, six hundred seventy-three thousand, eight hundred fifty-four".