21489350 has 24 divisors (see below), whose sum is σ = 40347120. Its totient is φ = 8514720.

The previous prime is 21489329. The next prime is 21489359. The reversal of 21489350 is 5398412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3479 + ... + 7421.

It is an arithmetic number, because the mean of its divisors is an integer number (1681130).

Almost surely, 2^21489350 is an apocalyptic number.

21489350 is a deficient number, since it is larger than the sum of its proper divisors (18857770).

21489350 is a wasteful number, since it uses less digits than its factorization.

21489350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064 (or 4059 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 21489350 is about 4635.6606864610. The cubic root of 21489350 is about 278.0189677033.

The spelling of 21489350 in words is "twenty-one million, four hundred eighty-nine thousand, three hundred fifty".