551212452421 has 2 divisors, whose sum is σ = 551212452422. Its totient is φ = 551212452420.

The previous prime is 551212452389. The next prime is 551212452451. The reversal of 551212452421 is 124254212155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411343932321 + 139868520100 = 641361^2 + 373990^2 .

It is a cyclic number.

It is not a de Polignac number, because 551212452421 - 2⁵ = 551212452389 is a prime.

It is a super-2 number, since 2×551212452421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551212452451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275606226210 + 275606226211.

It is an arithmetic number, because the mean of its divisors is an integer number (275606226211).

Almost surely, 2^551212452421 is an apocalyptic number.

It is an amenable number.

551212452421 is a deficient number, since it is larger than the sum of its proper divisors (1).

551212452421 is an equidigital number, since it uses as much as digits as its factorization.

551212452421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32000, while the sum is 34.

Adding to 551212452421 its reverse (124254212155), we get a palindrome (675466664576).

The spelling of 551212452421 in words is "five hundred fifty-one billion, two hundred twelve million, four hundred fifty-two thousand, four hundred twenty-one".