55221007 has 2 divisors, whose sum is σ = 55221008. Its totient is φ = 55221006.

The previous prime is 55220993. The next prime is 55221037. The reversal of 55221007 is 70012255.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55221007 is a prime.

It is a super-2 number, since 2×55221007² = 6098719228188098, 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 (55221037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610503 + 27610504.

It is an arithmetic number, because the mean of its divisors is an integer number (27610504).

Almost surely, 2^55221007 is an apocalyptic number.

55221007 is a deficient number, since it is larger than the sum of its proper divisors (1).

55221007 is an equidigital number, since it uses as much as digits as its factorization.

55221007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 55221007 is about 7431.0838375031. The cubic root of 55221007 is about 380.8039465929.

The spelling of 55221007 in words is "fifty-five million, two hundred twenty-one thousand, seven".