21512502415343 has 16 divisors (see below), whose sum is σ = 21584654208000. Its totient is φ = 21440504479392.

The previous prime is 21512502415331. The next prime is 21512502415399. The reversal of 21512502415343 is 34351420521512.

It is a cyclic number.

It is not a de Polignac number, because 21512502415343 - 2⁶ = 21512502415279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21512502415297 and 21512502415306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512502414343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879161513 + ... + 879185981.

It is an arithmetic number, because the mean of its divisors is an integer number (1349040888000).

Almost surely, 2^{21512502415343} is an apocalyptic number.

21512502415343 is a deficient number, since it is larger than the sum of its proper divisors (72151792657).

21512502415343 is a wasteful number, since it uses less digits than its factorization.

21512502415343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27494.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 21512502415343 its reverse (34351420521512), we get a palindrome (55863922936855).

The spelling of 21512502415343 in words is "twenty-one trillion, five hundred twelve billion, five hundred two million, four hundred fifteen thousand, three hundred forty-three".