21513212641043 has 8 divisors (see below), whose sum is σ = 21528559961088. Its totient is φ = 21497867762184.

The previous prime is 21513212641031. The next prime is 21513212641139. The reversal of 21513212641043 is 34014621231512.

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 21513212641043 - 2²⁴ = 21513195863827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21513212640994 and 21513212641012.

It is not an unprimeable number, because it can be changed into a prime (21513212641243) 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, 17206430 + ... + 18414332.

It is an arithmetic number, because the mean of its divisors is an integer number (2691069995136).

Almost surely, 2^{21513212641043} is an apocalyptic number.

21513212641043 is a deficient number, since it is larger than the sum of its proper divisors (15347320045).

21513212641043 is a wasteful number, since it uses less digits than its factorization.

21513212641043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220593.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 21513212641043 its reverse (34014621231512), we get a palindrome (55527833872555).

The spelling of 21513212641043 in words is "twenty-one trillion, five hundred thirteen billion, two hundred twelve million, six hundred forty-one thousand, forty-three".