21347781152 has 12 divisors (see below), whose sum is σ = 42028444206. Its totient is φ = 10673890560.

The previous prime is 21347781137. The next prime is 21347781163. The reversal of 21347781152 is 25118774312.

It can be written as a sum of positive squares in only one way, i.e., 18269306896 + 3078474256 = 135164^2 + 55484^2 .

It is a super-2 number, since 2×21347781152² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333559049 + ... + 333559112.

Almost surely, 2^21347781152 is an apocalyptic number.

It is an amenable number.

21347781152 is a deficient number, since it is larger than the sum of its proper divisors (20680663054).

21347781152 is an equidigital number, since it uses as much as digits as its factorization.

21347781152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667118171 (or 667118163 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The spelling of 21347781152 in words is "twenty-one billion, three hundred forty-seven million, seven hundred eighty-one thousand, one hundred fifty-two".