21490014 has 32 divisors (see below), whose sum is σ = 52899840. Its totient is φ = 5667552.

The previous prime is 21490013. The next prime is 21490031. The reversal of 21490014 is 41009412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490013) 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, 19134 + ... + 20225.

It is an arithmetic number, because the mean of its divisors is an integer number (1653120).

Almost surely, 2^21490014 is an apocalyptic number.

21490014 is an abundant number, since it is smaller than the sum of its proper divisors (31409826).

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

21490014 is a wasteful number, since it uses less digits than its factorization.

21490014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39384.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21490014 is about 4635.7323046095. The cubic root of 21490014 is about 278.0218311790.

Adding to 21490014 its reverse (41009412), we get a palindrome (62499426).

The spelling of 21490014 in words is "twenty-one million, four hundred ninety thousand, fourteen".