21240034 has 8 divisors (see below), whose sum is σ = 32089680. Its totient is φ = 10543476.

The previous prime is 21240001. The next prime is 21240049. The reversal of 21240034 is 43004212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21240034² = 902278088642312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37924 + ... + 38479.

It is an arithmetic number, because the mean of its divisors is an integer number (4011210).

Almost surely, 2^21240034 is an apocalyptic number.

21240034 is a deficient number, since it is larger than the sum of its proper divisors (10849646).

21240034 is a wasteful number, since it uses less digits than its factorization.

21240034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76544.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21240034 is about 4608.6911374055. The cubic root of 21240034 is about 276.9396054910.

Adding to 21240034 its reverse (43004212), we get a palindrome (64244246).

The spelling of 21240034 in words is "twenty-one million, two hundred forty thousand, thirty-four".