2154220101 has 48 divisors (see below), whose sum is σ = 3532259328. Its totient is φ = 1253296800.

The previous prime is 2154220051. The next prime is 2154220109. The reversal of 2154220101 is 1010224512.

2154220101 is a `hidden beast` number, since 2 + 1 + 542 + 20 + 101 = 666.

It is not a de Polignac number, because 2154220101 - 2⁶ = 2154220037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154220109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 387000 + ... + 392526.

It is an arithmetic number, because the mean of its divisors is an integer number (73588736).

Almost surely, 2^2154220101 is an apocalyptic number.

It is an amenable number.

2154220101 is a deficient number, since it is larger than the sum of its proper divisors (1378039227).

2154220101 is a wasteful number, since it uses less digits than its factorization.

2154220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702 (or 5699 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2154220101 is about 46413.5766882924. The cubic root of 2154220101 is about 1291.5067826761.

Adding to 2154220101 its reverse (1010224512), we get a palindrome (3164444613).

The spelling of 2154220101 in words is "two billion, one hundred fifty-four million, two hundred twenty thousand, one hundred one".