21771382274 has 32 divisors (see below), whose sum is σ = 35216916480. Its totient is φ = 10064854800.

The previous prime is 21771382247. The next prime is 21771382319. The reversal of 21771382274 is 47228317712.

It is a super-2 number, since 2×21771382274² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1290707 + ... + 1307465.

It is an arithmetic number, because the mean of its divisors is an integer number (1100528640).

Almost surely, 2^21771382274 is an apocalyptic number.

21771382274 is a deficient number, since it is larger than the sum of its proper divisors (13445534206).

21771382274 is a wasteful number, since it uses less digits than its factorization.

21771382274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17726.

The product of its digits is 263424, while the sum is 44.

Adding to 21771382274 its reverse (47228317712), we get a palindrome (68999699986).

The spelling of 21771382274 in words is "twenty-one billion, seven hundred seventy-one million, three hundred eighty-two thousand, two hundred seventy-four".