21365035474551 has 8 divisors (see below), whose sum is σ = 28487242819584. Its totient is φ = 14243092556280.

The previous prime is 21365035474513. The next prime is 21365035474571. The reversal of 21365035474551 is 15547453056312.

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

It is not a de Polignac number, because 21365035474551 - 2¹⁷ = 21365035343479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21365035474494 and 21365035474503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365035474571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65918085 + ... + 66241406.

It is an arithmetic number, because the mean of its divisors is an integer number (3560905352448).

Almost surely, 2^{21365035474551} is an apocalyptic number.

21365035474551 is a deficient number, since it is larger than the sum of its proper divisors (7122207345033).

21365035474551 is a wasteful number, since it uses less digits than its factorization.

21365035474551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132213381.

The product of its (nonzero) digits is 7560000, while the sum is 51.

The spelling of 21365035474551 in words is "twenty-one trillion, three hundred sixty-five billion, thirty-five million, four hundred seventy-four thousand, five hundred fifty-one".