20206214621 has 2 divisors, whose sum is σ = 20206214622. Its totient is φ = 20206214620.

The previous prime is 20206214593. The next prime is 20206214647. The reversal of 20206214621 is 12641260202.

It is an a-pointer prime, because the next prime (20206214647) can be obtained adding 20206214621 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17111517721 + 3094696900 = 130811^2 + 55630^2 .

It is a cyclic number.

It is not a de Polignac number, because 20206214621 - 2¹⁴ = 20206198237 is a prime.

It is a super-2 number, since 2×20206214621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20206214321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103107310 + 10103107311.

It is an arithmetic number, because the mean of its divisors is an integer number (10103107311).

Almost surely, 2^20206214621 is an apocalyptic number.

It is an amenable number.

20206214621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20206214621 is an equidigital number, since it uses as much as digits as its factorization.

20206214621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 20206214621 its reverse (12641260202), we get a palindrome (32847474823).

The spelling of 20206214621 in words is "twenty billion, two hundred six million, two hundred fourteen thousand, six hundred twenty-one".