21007514 has 16 divisors (see below), whose sum is σ = 34503840. Its totient is φ = 9513360.

The previous prime is 21007501. The next prime is 21007523. The reversal of 21007514 is 41570012.

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, 4817 + ... + 8075.

It is an arithmetic number, because the mean of its divisors is an integer number (2156490).

Almost surely, 2^21007514 is an apocalyptic number.

21007514 is a deficient number, since it is larger than the sum of its proper divisors (13496326).

21007514 is a wasteful number, since it uses less digits than its factorization.

21007514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21007514 is about 4583.3954662455. The cubic root of 21007514 is about 275.9253193591.

Adding to 21007514 its reverse (41570012), we get a palindrome (62577526).

It can be divided in two parts, 2 and 1007514, that multiplied together give a triangular number (2015028 = T₂₀₀₇).

The spelling of 21007514 in words is "twenty-one million, seven thousand, five hundred fourteen".