21512462241 has 8 divisors (see below), whose sum is σ = 29382875424. Its totient is φ = 13991845280.

The previous prime is 21512462227. The next prime is 21512462249. The reversal of 21512462241 is 14226421512.

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

It is a cyclic number.

It is not a de Polignac number, because 21512462241 - 2²¹ = 21510365089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21512462199 and 21512462208.

It is not an unprimeable number, because it can be changed into a prime (21512462249) 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, 87448911 + ... + 87449156.

It is an arithmetic number, because the mean of its divisors is an integer number (3672859428).

Almost surely, 2^21512462241 is an apocalyptic number.

It is an amenable number.

21512462241 is a deficient number, since it is larger than the sum of its proper divisors (7870413183).

21512462241 is a wasteful number, since it uses less digits than its factorization.

21512462241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174898111.

The product of its digits is 7680, while the sum is 30.

Adding to 21512462241 its reverse (14226421512), we get a palindrome (35738883753).

The spelling of 21512462241 in words is "twenty-one billion, five hundred twelve million, four hundred sixty-two thousand, two hundred forty-one".