55010421 has 20 divisors (see below), whose sum is σ = 82376800. Its totient is φ = 36584136.

The previous prime is 55010393. The next prime is 55010429. The reversal of 55010421 is 12401055.

It is not a de Polignac number, because 55010421 - 2¹³ = 55002229 is a prime.

It is a super-2 number, since 2×55010421² = 6052292837194482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55010394 and 55010403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55010429) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59400 + ... + 60318.

It is an arithmetic number, because the mean of its divisors is an integer number (4118840).

Almost surely, 2^55010421 is an apocalyptic number.

It is an amenable number.

55010421 is a deficient number, since it is larger than the sum of its proper divisors (27366379).

55010421 is an equidigital number, since it uses as much as digits as its factorization.

55010421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 55010421 is about 7416.9010374954. The cubic root of 55010421 is about 380.3192630852.

Adding to 55010421 its reverse (12401055), we get a palindrome (67411476).

The spelling of 55010421 in words is "fifty-five million, ten thousand, four hundred twenty-one".