20421314454643 has 8 divisors (see below), whose sum is σ = 20739542643968. Its totient is φ = 20103481337544.

The previous prime is 20421314454587. The next prime is 20421314454659. The reversal of 20421314454643 is 34645441312402.

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-20421314454643 is a prime.

It is a super-2 number, since 2×20421314454643² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20421314454643.

It is not an unprimeable number, because it can be changed into a prime (20421314455643) 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, 98663871 + ... + 98870632.

It is an arithmetic number, because the mean of its divisors is an integer number (2592442830496).

Almost surely, 2^{20421314454643} is an apocalyptic number.

20421314454643 is a deficient number, since it is larger than the sum of its proper divisors (318228189325).

20421314454643 is a wasteful number, since it uses less digits than its factorization.

20421314454643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197536113.

The product of its (nonzero) digits is 1105920, while the sum is 43.

The spelling of 20421314454643 in words is "twenty trillion, four hundred twenty-one billion, three hundred fourteen million, four hundred fifty-four thousand, six hundred forty-three".