55554021 has 12 divisors (see below), whose sum is σ = 81375840. Its totient is φ = 36513960.

The previous prime is 55554013. The next prime is 55554029. The reversal of 55554021 is 12045555.

It is an interprime number because it is at equal distance from previous prime (55554013) and next prime (55554029).

It is not a de Polignac number, because 55554021 - 2³ = 55554013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55554029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42831 + ... + 44108.

It is an arithmetic number, because the mean of its divisors is an integer number (6781320).

Almost surely, 2^55554021 is an apocalyptic number.

It is an amenable number.

55554021 is a deficient number, since it is larger than the sum of its proper divisors (25821819).

55554021 is a wasteful number, since it uses less digits than its factorization.

55554021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87016 (or 87013 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 55554021 is about 7453.4569831723. The cubic root of 55554021 is about 381.5679008969.

Adding to 55554021 its reverse (12045555), we get a palindrome (67599576).

The spelling of 55554021 in words is "fifty-five million, five hundred fifty-four thousand, twenty-one".