21650034 has 16 divisors (see below), whose sum is σ = 49485888. Its totient is φ = 6185712.

The previous prime is 21650021. The next prime is 21650087. The reversal of 21650034 is 43005612.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257697 + ... + 257780.

It is an arithmetic number, because the mean of its divisors is an integer number (3092868).

Almost surely, 2^21650034 is an apocalyptic number.

21650034 is an abundant number, since it is smaller than the sum of its proper divisors (27835854).

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

21650034 is a wasteful number, since it uses less digits than its factorization.

21650034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515489.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21650034 is about 4652.9597032427. The cubic root of 21650034 is about 278.7101986916.

Adding to 21650034 its reverse (43005612), we get a palindrome (64655646).

The spelling of 21650034 in words is "twenty-one million, six hundred fifty thousand, thirty-four".