21014140421 has 4 divisors (see below), whose sum is σ = 21016193100. Its totient is φ = 21012087744.

The previous prime is 21014140409. The next prime is 21014140481. The reversal of 21014140421 is 12404141012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18779687521 + 2234452900 = 137039^2 + 47270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014140421 - 2¹⁰ = 21014139397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21014140393 and 21014140402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014140481) 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, 1010906 + ... + 1031483.

It is an arithmetic number, because the mean of its divisors is an integer number (5254048275).

Almost surely, 2^21014140421 is an apocalyptic number.

It is an amenable number.

21014140421 is a deficient number, since it is larger than the sum of its proper divisors (2052679).

21014140421 is a wasteful number, since it uses less digits than its factorization.

21014140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052678.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21014140421 its reverse (12404141012), we get a palindrome (33418281433).

The spelling of 21014140421 in words is "twenty-one billion, fourteen million, one hundred forty thousand, four hundred twenty-one".