21980607 has 8 divisors (see below), whose sum is σ = 31971840. Its totient is φ = 13321560.

The previous prime is 21980593. The next prime is 21980653. The reversal of 21980607 is 70608912.

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

It is not a de Polignac number, because 21980607 - 2¹² = 21976511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 666079 = 21980607 / (2 + 1 + 9 + 8 + 0 + 6 + 0 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333007 + ... + 333072.

It is an arithmetic number, because the mean of its divisors is an integer number (3996480).

Almost surely, 2^21980607 is an apocalyptic number.

21980607 is a deficient number, since it is larger than the sum of its proper divisors (9991233).

21980607 is a wasteful number, since it uses less digits than its factorization.

21980607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666093.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21980607 is about 4688.3480032950. The cubic root of 21980607 is about 280.1215756058.

The spelling of 21980607 in words is "twenty-one million, nine hundred eighty thousand, six hundred seven".