21034719 has 24 divisors (see below), whose sum is σ = 31903872. Its totient is φ = 13329360.

The previous prime is 21034687. The next prime is 21034723. The reversal of 21034719 is 91743012.

It is not a de Polignac number, because 21034719 - 2⁵ = 21034687 is a prime.

It is a super-2 number, since 2×21034719² = 884918806817922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21034692 and 21034701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21039719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63384 + ... + 63714.

It is an arithmetic number, because the mean of its divisors is an integer number (1329328).

Almost surely, 2^21034719 is an apocalyptic number.

21034719 is a deficient number, since it is larger than the sum of its proper divisors (10869153).

21034719 is a wasteful number, since it uses less digits than its factorization.

21034719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21034719 is about 4586.3622839893. The cubic root of 21034719 is about 276.0443769224.

The spelling of 21034719 in words is "twenty-one million, thirty-four thousand, seven hundred nineteen".