21435513454 has 4 divisors (see below), whose sum is σ = 32153270184. Its totient is φ = 10717756726.

The previous prime is 21435513349. The next prime is 21435513467. The reversal of 21435513454 is 45431553412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358878362 + ... + 5358878365.

It is an arithmetic number, because the mean of its divisors is an integer number (8038317546).

Almost surely, 2^21435513454 is an apocalyptic number.

21435513454 is a deficient number, since it is larger than the sum of its proper divisors (10717756730).

21435513454 is a wasteful number, since it uses less digits than its factorization.

21435513454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10717756729.

The product of its digits is 144000, while the sum is 37.

The spelling of 21435513454 in words is "twenty-one billion, four hundred thirty-five million, five hundred thirteen thousand, four hundred fifty-four".