21264752461 has 8 divisors (see below), whose sum is σ = 21777665184. Its totient is φ = 20752675440.

The previous prime is 21264752437. The next prime is 21264752473. The reversal of 21264752461 is 16425746212.

It is a happy number.

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 21264752461 - 2¹³ = 21264744269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264752401) 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, 157270 + ... + 259351.

It is an arithmetic number, because the mean of its divisors is an integer number (2722208148).

Almost surely, 2^21264752461 is an apocalyptic number.

It is an amenable number.

21264752461 is a deficient number, since it is larger than the sum of its proper divisors (512912723).

21264752461 is a wasteful number, since it uses less digits than its factorization.

21264752461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417851.

The product of its digits is 161280, while the sum is 40.

The spelling of 21264752461 in words is "twenty-one billion, two hundred sixty-four million, seven hundred fifty-two thousand, four hundred sixty-one".