21261120074 has 8 divisors (see below), whose sum is σ = 33767661348. Its totient is φ = 10005232960.

The previous prime is 21261120071. The next prime is 21261120107. The reversal of 21261120074 is 47002116212.

It can be written as a sum of positive squares in 2 ways, for example, as 21177525625 + 83594449 = 145525^2 + 9143^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21261120071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312663497 + ... + 312663564.

Almost surely, 2^21261120074 is an apocalyptic number.

21261120074 is a deficient number, since it is larger than the sum of its proper divisors (12506541274).

21261120074 is a wasteful number, since it uses less digits than its factorization.

21261120074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625327080.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21261120074 its reverse (47002116212), we get a palindrome (68263236286).

The spelling of 21261120074 in words is "twenty-one billion, two hundred sixty-one million, one hundred twenty thousand, seventy-four".