21980510 has 16 divisors (see below), whose sum is σ = 40530672. Its totient is φ = 8577600.

The previous prime is 21980467. The next prime is 21980513. The reversal of 21980510 is 1508912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21980510.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26396 + ... + 27215.

It is an arithmetic number, because the mean of its divisors is an integer number (2533167).

Almost surely, 2^21980510 is an apocalyptic number.

21980510 is a deficient number, since it is larger than the sum of its proper divisors (18550162).

21980510 is a wasteful number, since it uses less digits than its factorization.

21980510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53659.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 21980510 is about 4688.3376584883. The cubic root of 21980510 is about 280.1211635481.

The spelling of 21980510 in words is "twenty-one million, nine hundred eighty thousand, five hundred ten".