21154506321413 has 16 divisors (see below), whose sum is σ = 23613379282944. Its totient is φ = 18857907022080.

The previous prime is 21154506321397. The next prime is 21154506321479. The reversal of 21154506321413 is 31412360545112.

It is a cyclic number.

It is not a de Polignac number, because 21154506321413 - 2⁴ = 21154506321397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154506320413) 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, 427011170 + ... + 427060707.

It is an arithmetic number, because the mean of its divisors is an integer number (1475836205184).

Almost surely, 2^{21154506321413} is an apocalyptic number.

It is an amenable number.

21154506321413 is a deficient number, since it is larger than the sum of its proper divisors (2458872961531).

21154506321413 is a wasteful number, since it uses less digits than its factorization.

21154506321413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854071972.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 21154506321413 its reverse (31412360545112), we get a palindrome (52566866866525).

The spelling of 21154506321413 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred six million, three hundred twenty-one thousand, four hundred thirteen".