20210421043 has 8 divisors (see below), whose sum is σ = 20246293440. Its totient is φ = 20174573160.

The previous prime is 20210421041. The next prime is 20210421061. The reversal of 20210421043 is 34012401202.

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 20210421043 - 2¹ = 20210421041 is a prime.

It is a super-2 number, since 2×20210421043² (a number of 21 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 20210421043.

It is not an unprimeable number, because it can be changed into a prime (20210421041) 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, 2469348 + ... + 2477518.

It is an arithmetic number, because the mean of its divisors is an integer number (2530786680).

Almost surely, 2^20210421043 is an apocalyptic number.

20210421043 is a deficient number, since it is larger than the sum of its proper divisors (35872397).

20210421043 is an equidigital number, since it uses as much as digits as its factorization.

20210421043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12257.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20210421043 its reverse (34012401202), we get a palindrome (54222822245).

The spelling of 20210421043 in words is "twenty billion, two hundred ten million, four hundred twenty-one thousand, forty-three".