21342010021 has 16 divisors (see below), whose sum is σ = 21865701376. Its totient is φ = 20824893936.

The previous prime is 21342010003. The next prime is 21342010057. The reversal of 21342010021 is 12001024312.

It is a cyclic number.

It is not a de Polignac number, because 21342010021 - 2⁷ = 21342009893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21342009977 and 21342010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342010121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6694990 + ... + 6698176.

It is an arithmetic number, because the mean of its divisors is an integer number (1366606336).

Almost surely, 2^21342010021 is an apocalyptic number.

It is an amenable number.

21342010021 is a deficient number, since it is larger than the sum of its proper divisors (523691355).

21342010021 is a wasteful number, since it uses less digits than its factorization.

21342010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21342010021 its reverse (12001024312), we get a palindrome (33343034333).

The spelling of 21342010021 in words is "twenty-one billion, three hundred forty-two million, ten thousand, twenty-one".