55521102 has 64 divisors (see below), whose sum is σ = 138991104. Its totient is φ = 14394240.

The previous prime is 55521083. The next prime is 55521131. The reversal of 55521102 is 20112555.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32473 + ... + 34139.

It is an arithmetic number, because the mean of its divisors is an integer number (2171736).

Almost surely, 2^55521102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55521102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69495552).

55521102 is an abundant number, since it is smaller than the sum of its proper divisors (83470002).

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

55521102 is a wasteful number, since it uses less digits than its factorization.

55521102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 55521102 is about 7451.2483517864. The cubic root of 55521102 is about 381.4925189214.

Adding to 55521102 its reverse (20112555), we get a palindrome (75633657).

The spelling of 55521102 in words is "fifty-five million, five hundred twenty-one thousand, one hundred two".