2154021206 has 8 divisors (see below), whose sum is σ = 3285795240. Its totient is φ = 1058756128.

The previous prime is 2154021137. The next prime is 2154021209. The reversal of 2154021206 is 6021204512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154021209) 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, 9127091 + ... + 9127326.

It is an arithmetic number, because the mean of its divisors is an integer number (410724405).

Almost surely, 2^2154021206 is an apocalyptic number.

2154021206 is a deficient number, since it is larger than the sum of its proper divisors (1131774034).

2154021206 is a wasteful number, since it uses less digits than its factorization.

2154021206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18254478.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2154021206 is about 46411.4340006857. The cubic root of 2154021206 is about 1291.4670340068.

Adding to 2154021206 its reverse (6021204512), we get a palindrome (8175225718).

The spelling of 2154021206 in words is "two billion, one hundred fifty-four million, twenty-one thousand, two hundred six".