21454410461 has 4 divisors (see below), whose sum is σ = 23404811424. Its totient is φ = 19504009500.

The previous prime is 21454410457. The next prime is 21454410553. The reversal of 21454410461 is 16401445412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21454410461 - 2² = 21454410457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454410361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975200465 + ... + 975200486.

It is an arithmetic number, because the mean of its divisors is an integer number (5851202856).

Almost surely, 2^21454410461 is an apocalyptic number.

It is an amenable number.

21454410461 is a deficient number, since it is larger than the sum of its proper divisors (1950400963).

21454410461 is a wasteful number, since it uses less digits than its factorization.

21454410461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950400962.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21454410461 its reverse (16401445412), we get a palindrome (37855855873).

The spelling of 21454410461 in words is "twenty-one billion, four hundred fifty-four million, four hundred ten thousand, four hundred sixty-one".