21352545451 has 8 divisors (see below), whose sum is σ = 21981995280. Its totient is φ = 20725851168.

The previous prime is 21352545437. The next prime is 21352545457. The reversal of 21352545451 is 15454525312.

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 21352545451 - 2⁷ = 21352545323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21352545451.

It is not an unprimeable number, because it can be changed into a prime (21352545457) 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, 673156 + ... + 704161.

It is an arithmetic number, because the mean of its divisors is an integer number (2747749410).

Almost surely, 2^21352545451 is an apocalyptic number.

21352545451 is a deficient number, since it is larger than the sum of its proper divisors (629449829).

21352545451 is a wasteful number, since it uses less digits than its factorization.

21352545451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377773.

The product of its digits is 120000, while the sum is 37.

The spelling of 21352545451 in words is "twenty-one billion, three hundred fifty-two million, five hundred forty-five thousand, four hundred fifty-one".