21402432453 has 8 divisors (see below), whose sum is σ = 28537600000. Its totient is φ = 14267776608.

The previous prime is 21402432439. The next prime is 21402432461. The reversal of 21402432453 is 35423420412.

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

It is not a de Polignac number, because 21402432453 - 2¹⁰ = 21402431429 is a prime.

It is a super-2 number, since 2×21402432453² (a number of 21 digits) contains 22 as substring.

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 21402432453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402432463) 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, 16453 + ... + 207546.

It is an arithmetic number, because the mean of its divisors is an integer number (3567200000).

Almost surely, 2^21402432453 is an apocalyptic number.

It is an amenable number.

21402432453 is a deficient number, since it is larger than the sum of its proper divisors (7135167547).

21402432453 is a wasteful number, since it uses less digits than its factorization.

21402432453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255851.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21402432453 its reverse (35423420412), we get a palindrome (56825852865).

The spelling of 21402432453 in words is "twenty-one billion, four hundred two million, four hundred thirty-two thousand, four hundred fifty-three".