55520421111 has 8 divisors (see below), whose sum is σ = 82252475760. Its totient is φ = 37013614056.

The previous prime is 55520421107. The next prime is 55520421233. The reversal of 55520421111 is 11112402555.

It is a happy number.

55520421111 is a `hidden beast` number, since 5 + 5 + 520 + 4 + 21 + 111 = 666.

It is not a de Polignac number, because 55520421111 - 2² = 55520421107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2056311893 = 55520421111 / (5 + 5 + 5 + 2 + 0 + 4 + 2 + 1 + 1 + 1 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520421311) 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, 1028155920 + ... + 1028155973.

It is an arithmetic number, because the mean of its divisors is an integer number (10281559470).

Almost surely, 2^55520421111 is an apocalyptic number.

55520421111 is a deficient number, since it is larger than the sum of its proper divisors (26732054649).

55520421111 is a wasteful number, since it uses less digits than its factorization.

55520421111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056311902 (or 2056311896 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 55520421111 its reverse (11112402555), we get a palindrome (66632823666).

The spelling of 55520421111 in words is "fifty-five billion, five hundred twenty million, four hundred twenty-one thousand, one hundred eleven".