55221015404240 has 40 divisors (see below), whose sum is σ = 146730126647040. Its totient is φ = 18932919566976.

The previous prime is 55221015404239. The next prime is 55221015404273. The reversal of 55221015404240 is 4240451012255.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×55221015404240² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 55221015404240.

It is a congruent number.

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, 49304477480 + ... + 49304478599.

It is an arithmetic number, because the mean of its divisors is an integer number (3668253166176).

Almost surely, 2^{55221015404240} is an apocalyptic number.

It is an amenable number.

55221015404240 is an abundant number, since it is smaller than the sum of its proper divisors (91509111242800).

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

55221015404240 is a wasteful number, since it uses less digits than its factorization.

55221015404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98608956099 (or 98608956093 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 55221015404240 its reverse (4240451012255), we get a palindrome (59461466416495).

The spelling of 55221015404240 in words is "fifty-five trillion, two hundred twenty-one billion, fifteen million, four hundred four thousand, two hundred forty".