55140355415221 has 4 divisors (see below), whose sum is σ = 55140440673472. Its totient is φ = 55140270156972.

The previous prime is 55140355415191. The next prime is 55140355415227. The reversal of 55140355415221 is 12251455304155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55140355415221 - 2²³ = 55140347026613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55140355415227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41651535 + ... + 42954988.

It is an arithmetic number, because the mean of its divisors is an integer number (13785110168368).

Almost surely, 2^{55140355415221} is an apocalyptic number.

It is an amenable number.

55140355415221 is a deficient number, since it is larger than the sum of its proper divisors (85258251).

55140355415221 is an equidigital number, since it uses as much as digits as its factorization.

55140355415221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85258250.

The product of its (nonzero) digits is 600000, while the sum is 43.

The spelling of 55140355415221 in words is "fifty-five trillion, one hundred forty billion, three hundred fifty-five million, four hundred fifteen thousand, two hundred twenty-one".