21014213021 has 8 divisors (see below), whose sum is σ = 21530040000. Its totient is φ = 20498542560.

The previous prime is 21014212991. The next prime is 21014213041. The reversal of 21014213021 is 12031241012.

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

It is a cyclic number.

It is not a de Polignac number, because 21014213021 - 2¹⁰ = 21014211997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014213041) 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, 260480 + ... + 331478.

It is an arithmetic number, because the mean of its divisors is an integer number (2691255000).

Almost surely, 2^21014213021 is an apocalyptic number.

It is an amenable number.

21014213021 is a deficient number, since it is larger than the sum of its proper divisors (515826979).

21014213021 is an equidigital number, since it uses as much as digits as its factorization.

21014213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78259.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21014213021 its reverse (12031241012), we get a palindrome (33045454033).

The spelling of 21014213021 in words is "twenty-one billion, fourteen million, two hundred thirteen thousand, twenty-one".