2156402101 has 4 divisors (see below), whose sum is σ = 2464459552. Its totient is φ = 1848344652.

The previous prime is 2156402089. The next prime is 2156402107. The reversal of 2156402101 is 1012046512.

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 not a de Polignac number, because 2156402101 - 2⁹ = 2156401589 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 (2156402107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154028715 + ... + 154028728.

It is an arithmetic number, because the mean of its divisors is an integer number (616114888).

Almost surely, 2^2156402101 is an apocalyptic number.

It is an amenable number.

2156402101 is a deficient number, since it is larger than the sum of its proper divisors (308057451).

2156402101 is an equidigital number, since it uses as much as digits as its factorization.

2156402101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308057450.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 2156402101 is about 46437.0767921496. The cubic root of 2156402101 is about 1291.9426893668.

Adding to 2156402101 its reverse (1012046512), we get a palindrome (3168448613).

The spelling of 2156402101 in words is "two billion, one hundred fifty-six million, four hundred two thousand, one hundred one".