2101400221 has 8 divisors (see below), whose sum is σ = 2239421184. Its totient is φ = 1967267280.

The previous prime is 2101400179. The next prime is 2101400251. The reversal of 2101400221 is 1220041012.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-2101400221 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 (2101400251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970890 + ... + 973051.

It is an arithmetic number, because the mean of its divisors is an integer number (279927648).

Almost surely, 2^2101400221 is an apocalyptic number.

It is an amenable number.

2101400221 is a deficient number, since it is larger than the sum of its proper divisors (138020963).

2101400221 is a wasteful number, since it uses less digits than its factorization.

2101400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944011.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2101400221 is about 45841.0320673521. The cubic root of 2101400221 is about 1280.8637198222.

Adding to 2101400221 its reverse (1220041012), we get a palindrome (3321441233).

The spelling of 2101400221 in words is "two billion, one hundred one million, four hundred thousand, two hundred twenty-one".