21340854 has 16 divisors (see below), whose sum is σ = 47424240. Its totient is φ = 7113600.

The previous prime is 21340811. The next prime is 21340859. The reversal of 21340854 is 45804312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340859) 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, 197547 + ... + 197654.

It is an arithmetic number, because the mean of its divisors is an integer number (2964015).

Almost surely, 2^21340854 is an apocalyptic number.

21340854 is an abundant number, since it is smaller than the sum of its proper divisors (26083386).

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

21340854 is a wasteful number, since it uses less digits than its factorization.

21340854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395212 (or 395206 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21340854 is about 4619.6162178259. The cubic root of 21340854 is about 277.3770967801.

The spelling of 21340854 in words is "twenty-one million, three hundred forty thousand, eight hundred fifty-four".