21451433861 has 8 divisors (see below), whose sum is σ = 25201684704. Its totient is φ = 18001203120.

The previous prime is 21451433849. The next prime is 21451433873. The reversal of 21451433861 is 16833415412.

It is an interprime number because it is at equal distance from previous prime (21451433849) and next prime (21451433873).

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 21451433861 - 2¹⁰ = 21451432837 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 (21451433821) 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, 75004871 + ... + 75005156.

It is an arithmetic number, because the mean of its divisors is an integer number (3150210588).

Almost surely, 2^21451433861 is an apocalyptic number.

It is an amenable number.

21451433861 is a deficient number, since it is larger than the sum of its proper divisors (3750250843).

21451433861 is a wasteful number, since it uses less digits than its factorization.

21451433861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150010051.

The product of its digits is 69120, while the sum is 38.

The spelling of 21451433861 in words is "twenty-one billion, four hundred fifty-one million, four hundred thirty-three thousand, eight hundred sixty-one".