2155221414 has 24 divisors (see below), whose sum is σ = 4915418040. Its totient is φ = 680596128.

The previous prime is 2155221403. The next prime is 2155221421. The reversal of 2155221414 is 4141225512.

It is a happy number.

2155221414 is a `hidden beast` number, since 21 + 5 + 5 + 221 + 414 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3150567 + ... + 3151250.

It is an arithmetic number, because the mean of its divisors is an integer number (204809085).

Almost surely, 2^2155221414 is an apocalyptic number.

2155221414 is an abundant number, since it is smaller than the sum of its proper divisors (2760196626).

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

2155221414 is a wasteful number, since it uses less digits than its factorization.

2155221414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6301844 (or 6301841 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2155221414 is about 46424.3622896427. The cubic root of 2155221414 is about 1291.7068554257.

Adding to 2155221414 its reverse (4141225512), we get a palindrome (6296446926).

The spelling of 2155221414 in words is "two billion, one hundred fifty-five million, two hundred twenty-one thousand, four hundred fourteen".