21770722 has 4 divisors (see below), whose sum is σ = 32656086. Its totient is φ = 10885360.

The previous prime is 21770701. The next prime is 21770731. The reversal of 21770722 is 22707712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15515721 + 6255001 = 3939^2 + 2501^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5442679 + ... + 5442682.

Almost surely, 2^21770722 is an apocalyptic number.

21770722 is a deficient number, since it is larger than the sum of its proper divisors (10885364).

21770722 is a wasteful number, since it uses less digits than its factorization.

21770722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10885363.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 21770722 is about 4665.9106292341. The cubic root of 21770722 is about 279.2271288461.

The spelling of 21770722 in words is "twenty-one million, seven hundred seventy thousand, seven hundred twenty-two".