21377026 has 8 divisors (see below), whose sum is σ = 34980624. Its totient is φ = 9716820.

The previous prime is 21376991. The next prime is 21377029. The reversal of 21377026 is 62077312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21376985 and 21377003.

It is not an unprimeable number, because it can be changed into a prime (21377029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485820 + ... + 485863.

It is an arithmetic number, because the mean of its divisors is an integer number (4372578).

Almost surely, 2^21377026 is an apocalyptic number.

21377026 is a deficient number, since it is larger than the sum of its proper divisors (13603598).

21377026 is a wasteful number, since it uses less digits than its factorization.

21377026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971696.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21377026 is about 4623.5296041012. The cubic root of 21377026 is about 277.5337231424.

The spelling of 21377026 in words is "twenty-one million, three hundred seventy-seven thousand, twenty-six".