551372021 has 2 divisors, whose sum is σ = 551372022. Its totient is φ = 551372020.

The previous prime is 551371991. The next prime is 551372053. The reversal of 551372021 is 120273155.

551372021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294122500 + 257249521 = 17150^2 + 16039^2 .

It is a cyclic number.

It is not a de Polignac number, because 551372021 - 2²² = 547177717 is a prime.

It is a super-2 number, since 2×551372021² = 608022211083248882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551372221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275686010 + 275686011.

It is an arithmetic number, because the mean of its divisors is an integer number (275686011).

Almost surely, 2^551372021 is an apocalyptic number.

It is an amenable number.

551372021 is a deficient number, since it is larger than the sum of its proper divisors (1).

551372021 is an equidigital number, since it uses as much as digits as its factorization.

551372021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 551372021 is about 23481.3121652092. The cubic root of 551372021 is about 820.0019933523.

The spelling of 551372021 in words is "five hundred fifty-one million, three hundred seventy-two thousand, twenty-one".