21700014 has 64 divisors (see below), whose sum is σ = 53084160. Its totient is φ = 5775840.

The previous prime is 21700001. The next prime is 21700039. The reversal of 21700014 is 41000712.

It is a junction number, because it is equal to n+sod(n) for n = 21699966 and 21700002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56467 + ... + 56849.

It is an arithmetic number, because the mean of its divisors is an integer number (829440).

Almost surely, 2^21700014 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21700014, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26542080).

21700014 is an abundant number, since it is smaller than the sum of its proper divisors (31384146).

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

21700014 is a wasteful number, since it uses less digits than its factorization.

21700014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21700014 is about 4658.3273822264. The cubic root of 21700014 is about 278.9245052092.

Adding to 21700014 its reverse (41000712), we get a palindrome (62700726).

The spelling of 21700014 in words is "twenty-one million, seven hundred thousand, fourteen".