55276421 has 2 divisors, whose sum is σ = 55276422. Its totient is φ = 55276420.

The previous prime is 55276399. The next prime is 55276447. The reversal of 55276421 is 12467255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 21520321 = 5810^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 55276421 - 2¹⁰ = 55275397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55276471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27638210 + 27638211.

It is an arithmetic number, because the mean of its divisors is an integer number (27638211).

Almost surely, 2^55276421 is an apocalyptic number.

It is an amenable number.

55276421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55276421 is an equidigital number, since it uses as much as digits as its factorization.

55276421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 55276421 is about 7434.8114300230. The cubic root of 55276421 is about 380.9312822841.

The spelling of 55276421 in words is "fifty-five million, two hundred seventy-six thousand, four hundred twenty-one".