21421042213213 has 16 divisors (see below), whose sum is σ = 21638899744000. Its totient is φ = 21203582258880.

The previous prime is 21421042213177. The next prime is 21421042213261. The reversal of 21421042213213 is 31231224012412.

It is a cyclic number.

It is not a de Polignac number, because 21421042213213 - 2¹³ = 21421042205021 is a prime.

It is a super-2 number, since 2×21421042213213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421042213283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534024028 + ... + 534064138.

It is an arithmetic number, because the mean of its divisors is an integer number (1352431234000).

Almost surely, 2^{21421042213213} is an apocalyptic number.

It is an amenable number.

21421042213213 is a deficient number, since it is larger than the sum of its proper divisors (217857530787).

21421042213213 is a wasteful number, since it uses less digits than its factorization.

21421042213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44932.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21421042213213 its reverse (31231224012412), we get a palindrome (52652266225625).

The spelling of 21421042213213 in words is "twenty-one trillion, four hundred twenty-one billion, forty-two million, two hundred thirteen thousand, two hundred thirteen".