20214121687 has 2 divisors, whose sum is σ = 20214121688. Its totient is φ = 20214121686.

The previous prime is 20214121673. The next prime is 20214121693. The reversal of 20214121687 is 78612141202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20214121687 - 2⁷ = 20214121559 is a prime.

It is a super-2 number, since 2×20214121687² (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 (20214121657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107060843 + 10107060844.

It is an arithmetic number, because the mean of its divisors is an integer number (10107060844).

Almost surely, 2^20214121687 is an apocalyptic number.

20214121687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20214121687 is an equidigital number, since it uses as much as digits as its factorization.

20214121687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

Adding to 20214121687 its reverse (78612141202), we get a palindrome (98826262889).

The spelling of 20214121687 in words is "twenty billion, two hundred fourteen million, one hundred twenty-one thousand, six hundred eighty-seven".