21770426 has 8 divisors (see below), whose sum is σ = 33452244. Its totient is φ = 10619680.

The previous prime is 21770423. The next prime is 21770429. The reversal of 21770426 is 62407712.

It is an interprime number because it is at equal distance from previous prime (21770423) and next prime (21770429).

It can be written as a sum of positive squares in 2 ways, for example, as 18931201 + 2839225 = 4351^2 + 1685^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21770423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132665 + ... + 132828.

Almost surely, 2^21770426 is an apocalyptic number.

21770426 is a deficient number, since it is larger than the sum of its proper divisors (11681818).

21770426 is a wasteful number, since it uses less digits than its factorization.

21770426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265536.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21770426 is about 4665.8789097018. The cubic root of 21770426 is about 279.2258633605.

The spelling of 21770426 in words is "twenty-one million, seven hundred seventy thousand, four hundred twenty-six".