21006812167413 has 8 divisors (see below), whose sum is σ = 28270850020128. Its totient is φ = 13873657879824.

The previous prime is 21006812167357. The next prime is 21006812167423. The reversal of 21006812167413 is 31476121860012.

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

It is not a de Polignac number, because 21006812167413 - 2¹² = 21006812163317 is a prime.

It is a super-2 number, since 2×21006812167413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006812167423) 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, 32720890906 + ... + 32720891547.

It is an arithmetic number, because the mean of its divisors is an integer number (3533856252516).

Almost surely, 2^{21006812167413} is an apocalyptic number.

It is an amenable number.

21006812167413 is a deficient number, since it is larger than the sum of its proper divisors (7264037852715).

21006812167413 is a wasteful number, since it uses less digits than its factorization.

21006812167413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65441782563.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 21006812167413 in words is "twenty-one trillion, six billion, eight hundred twelve million, one hundred sixty-seven thousand, four hundred thirteen".