21241686961 has 8 divisors (see below), whose sum is σ = 24180260544. Its totient is φ = 18471031920.

The previous prime is 21241686943. The next prime is 21241686967. The reversal of 21241686961 is 16968614212.

It is a happy number.

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

It is not a de Polignac number, because 21241686961 - 2¹⁵ = 21241654193 is a prime.

It is a super-3 number, since 3×21241686961³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21241686967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41979366 + ... + 41979871.

It is an arithmetic number, because the mean of its divisors is an integer number (3022532568).

Almost surely, 2^21241686961 is an apocalyptic number.

It is an amenable number.

21241686961 is a deficient number, since it is larger than the sum of its proper divisors (2938573583).

21241686961 is a wasteful number, since it uses less digits than its factorization.

21241686961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83959271.

The product of its digits is 248832, while the sum is 46.

The spelling of 21241686961 in words is "twenty-one billion, two hundred forty-one million, six hundred eighty-six thousand, nine hundred sixty-one".