21354351455 has 8 divisors (see below), whose sum is σ = 25797204000. Its totient is φ = 16968826336.

The previous prime is 21354351451. The next prime is 21354351511. The reversal of 21354351455 is 55415345312.

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 21354351455 - 2² = 21354351451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354351451) 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, 14331035 + ... + 14332524.

It is an arithmetic number, because the mean of its divisors is an integer number (3224650500).

Almost surely, 2^21354351455 is an apocalyptic number.

21354351455 is a deficient number, since it is larger than the sum of its proper divisors (4442852545).

21354351455 is a wasteful number, since it uses less digits than its factorization.

21354351455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28663713.

The product of its digits is 180000, while the sum is 38.

Adding to 21354351455 its reverse (55415345312), we get a palindrome (76769696767).

The spelling of 21354351455 in words is "twenty-one billion, three hundred fifty-four million, three hundred fifty-one thousand, four hundred fifty-five".