21343215133451 has 8 divisors (see below), whose sum is σ = 21661898173440. Its totient is φ = 21024535846248.

The previous prime is 21343215133433. The next prime is 21343215133469. The reversal of 21343215133451 is 15433151234312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21343215133433) and next prime (21343215133469).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343215133451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343215138451) 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, 11803610 + ... + 13491168.

It is an arithmetic number, because the mean of its divisors is an integer number (2707737271680).

Almost surely, 2^{21343215133451} is an apocalyptic number.

21343215133451 is a deficient number, since it is larger than the sum of its proper divisors (318683039989).

21343215133451 is a wasteful number, since it uses less digits than its factorization.

21343215133451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876393.

The product of its digits is 129600, while the sum is 38.

Adding to 21343215133451 its reverse (15433151234312), we get a palindrome (36776366367763).

The spelling of 21343215133451 in words is "twenty-one trillion, three hundred forty-three billion, two hundred fifteen million, one hundred thirty-three thousand, four hundred fifty-one".