55421004 has 24 divisors (see below), whose sum is σ = 130574080. Its totient is φ = 18293904.

The previous prime is 55420999. The next prime is 55421011. The reversal of 55421004 is 40012455.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21184 + ... + 23655.

Almost surely, 2^55421004 is an apocalyptic number.

It is an amenable number.

55421004 is an abundant number, since it is smaller than the sum of its proper divisors (75153076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55421004 is a wasteful number, since it uses less digits than its factorization.

55421004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44949 (or 44947 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 55421004 is about 7444.5284605541. The cubic root of 55421004 is about 381.2631189967.

Adding to 55421004 its reverse (40012455), we get a palindrome (95433459).

The spelling of 55421004 in words is "fifty-five million, four hundred twenty-one thousand, four".