20514202421 has 2 divisors, whose sum is σ = 20514202422. Its totient is φ = 20514202420.

The previous prime is 20514202409. The next prime is 20514202427. The reversal of 20514202421 is 12420241502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15897679396 + 4616523025 = 126086^2 + 67945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20514202421 - 2³⁰ = 19440460597 is a prime.

It is a super-2 number, since 2×20514202421² (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 (20514202427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257101210 + 10257101211.

It is an arithmetic number, because the mean of its divisors is an integer number (10257101211).

Almost surely, 2^20514202421 is an apocalyptic number.

It is an amenable number.

20514202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20514202421 is an equidigital number, since it uses as much as digits as its factorization.

20514202421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 20514202421 its reverse (12420241502), we get a palindrome (32934443923).

The spelling of 20514202421 in words is "twenty billion, five hundred fourteen million, two hundred two thousand, four hundred twenty-one".