21402051014011 has 4 divisors (see below), whose sum is σ = 21510690867072. Its totient is φ = 21293411160952.

The previous prime is 21402051013943. The next prime is 21402051014023. The reversal of 21402051014011 is 11041015020412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21402051014011 - 2¹¹ = 21402051011963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21402051014041) 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, 54319926235 + ... + 54319926628.

It is an arithmetic number, because the mean of its divisors is an integer number (5377672716768).

Almost surely, 2^{21402051014011} is an apocalyptic number.

21402051014011 is a deficient number, since it is larger than the sum of its proper divisors (108639853061).

21402051014011 is a wasteful number, since it uses less digits than its factorization.

21402051014011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108639853060.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 21402051014011 its reverse (11041015020412), we get a palindrome (32443066034423).

The spelling of 21402051014011 in words is "twenty-one trillion, four hundred two billion, fifty-one million, fourteen thousand, eleven".