551211454421 has 2 divisors, whose sum is σ = 551211454422. Its totient is φ = 551211454420.

The previous prime is 551211454373. The next prime is 551211454487. The reversal of 551211454421 is 124454112155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384506647396 + 166704807025 = 620086^2 + 408295^2 .

It is a cyclic number.

It is not a de Polignac number, because 551211454421 - 2²² = 551207260117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551211454721) 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, 275605727210 + 275605727211.

It is an arithmetic number, because the mean of its divisors is an integer number (275605727211).

Almost surely, 2^551211454421 is an apocalyptic number.

It is an amenable number.

551211454421 is a deficient number, since it is larger than the sum of its proper divisors (1).

551211454421 is an equidigital number, since it uses as much as digits as its factorization.

551211454421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32000, while the sum is 35.

Adding to 551211454421 its reverse (124454112155), we get a palindrome (675665566576).

The spelling of 551211454421 in words is "five hundred fifty-one billion, two hundred eleven million, four hundred fifty-four thousand, four hundred twenty-one".