21700854 has 48 divisors (see below), whose sum is σ = 54127008. Its totient is φ = 6155136.

The previous prime is 21700843. The next prime is 21700873. The reversal of 21700854 is 45800712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19234 + ... + 20330.

It is an arithmetic number, because the mean of its divisors is an integer number (1127646).

Almost surely, 2^21700854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21700854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27063504).

21700854 is an abundant number, since it is smaller than the sum of its proper divisors (32426154).

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

21700854 is a wasteful number, since it uses less digits than its factorization.

21700854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1266 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 21700854 is about 4658.4175424708. The cubic root of 21700854 is about 278.9281041864.

The spelling of 21700854 in words is "twenty-one million, seven hundred thousand, eight hundred fifty-four".