2101421011 has 4 divisors (see below), whose sum is σ = 2152675224. Its totient is φ = 2050166800.

The previous prime is 2101420999. The next prime is 2101421039. The reversal of 2101421011 is 1101241012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101421011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101420982 and 2101421000.

It is not an unprimeable number, because it can be changed into a prime (2101401011) 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, 25627045 + ... + 25627126.

It is an arithmetic number, because the mean of its divisors is an integer number (538168806).

Almost surely, 2^2101421011 is an apocalyptic number.

2101421011 is a deficient number, since it is larger than the sum of its proper divisors (51254213).

2101421011 is an equidigital number, since it uses as much as digits as its factorization.

2101421011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51254212.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2101421011 is about 45841.2588287015. The cubic root of 2101421011 is about 1280.8679438420.

Adding to 2101421011 its reverse (1101241012), we get a palindrome (3202662023).

It can be divided in two parts, 21014 and 21011, that added together give a square (42025 = 205²).

The spelling of 2101421011 in words is "two billion, one hundred one million, four hundred twenty-one thousand, eleven".