55460021 has 2 divisors, whose sum is σ = 55460022. Its totient is φ = 55460020.

The previous prime is 55459979. The next prime is 55460033. The reversal of 55460021 is 12006455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 7365796 = 6935^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 55460021 - 2²² = 51265717 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 (55460051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27730010 + 27730011.

It is an arithmetic number, because the mean of its divisors is an integer number (27730011).

Almost surely, 2^55460021 is an apocalyptic number.

It is an amenable number.

55460021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55460021 is an equidigital number, since it uses as much as digits as its factorization.

55460021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55460021 is about 7447.1485147001. The cubic root of 55460021 is about 381.3525691601.

Adding to 55460021 its reverse (12006455), we get a palindrome (67466476).

The spelling of 55460021 in words is "fifty-five million, four hundred sixty thousand, twenty-one".