55102421 has 8 divisors (see below), whose sum is σ = 60873600. Its totient is φ = 49458240.

The previous prime is 55102417. The next prime is 55102427. The reversal of 55102421 is 12420155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55102421 - 2² = 55102417 is a prime.

It is a super-2 number, since 2×55102421² = 6072553600122482, 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 = 55102393 and 55102402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55102427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30836 + ... + 32573.

It is an arithmetic number, because the mean of its divisors is an integer number (7609200).

Almost surely, 2^55102421 is an apocalyptic number.

It is an amenable number.

55102421 is a deficient number, since it is larger than the sum of its proper divisors (5771179).

55102421 is a wasteful number, since it uses less digits than its factorization.

55102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63499.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 55102421 is about 7423.1004977705. The cubic root of 55102421 is about 380.5311616318.

Adding to 55102421 its reverse (12420155), we get a palindrome (67522576).

The spelling of 55102421 in words is "fifty-five million, one hundred two thousand, four hundred twenty-one".