21261613241 has 8 divisors (see below), whose sum is σ = 24202943424. Its totient is φ = 18488359120.

The previous prime is 21261613231. The next prime is 21261613267. The reversal of 21261613241 is 14231616212.

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

It is not a de Polignac number, because 21261613241 - 2¹⁴ = 21261596857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21261613201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42018746 + ... + 42019251.

It is an arithmetic number, because the mean of its divisors is an integer number (3025367928).

Almost surely, 2^21261613241 is an apocalyptic number.

It is an amenable number.

21261613241 is a deficient number, since it is larger than the sum of its proper divisors (2941330183).

21261613241 is a wasteful number, since it uses less digits than its factorization.

21261613241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84038031.

The product of its digits is 3456, while the sum is 29.

The spelling of 21261613241 in words is "twenty-one billion, two hundred sixty-one million, six hundred thirteen thousand, two hundred forty-one".