20354462542621 has 4 divisors (see below), whose sum is σ = 21011058108544. Its totient is φ = 19697866976700.

The previous prime is 20354462542577. The next prime is 20354462542723. The reversal of 20354462542621 is 12624526445302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20354462542621 - 2²⁷ = 20354328324893 is a prime.

It is a super-2 number, since 2×20354462542621² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354462542321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328297782915 + ... + 328297782976.

It is an arithmetic number, because the mean of its divisors is an integer number (5252764527136).

Almost surely, 2^{20354462542621} is an apocalyptic number.

It is an amenable number.

20354462542621 is a deficient number, since it is larger than the sum of its proper divisors (656595565923).

20354462542621 is an equidigital number, since it uses as much as digits as its factorization.

20354462542621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656595565922.

The product of its (nonzero) digits is 2764800, while the sum is 46.

Adding to 20354462542621 its reverse (12624526445302), we get a palindrome (32978988987923).

The spelling of 20354462542621 in words is "twenty trillion, three hundred fifty-four billion, four hundred sixty-two million, five hundred forty-two thousand, six hundred twenty-one".