21214053121 has 2 divisors, whose sum is σ = 21214053122. Its totient is φ = 21214053120.

The previous prime is 21214053097. The next prime is 21214053127. The reversal of 21214053121 is 12135041212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19881000000 + 1333053121 = 141000^2 + 36511^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214053121 - 2²⁷ = 21079835393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21214053092 and 21214053101.

It is not a weakly prime, because it can be changed into another prime (21214053127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607026560 + 10607026561.

It is an arithmetic number, because the mean of its divisors is an integer number (10607026561).

Almost surely, 2^21214053121 is an apocalyptic number.

It is an amenable number.

21214053121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214053121 is an equidigital number, since it uses as much as digits as its factorization.

21214053121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21214053121 its reverse (12135041212), we get a palindrome (33349094333).

The spelling of 21214053121 in words is "twenty-one billion, two hundred fourteen million, fifty-three thousand, one hundred twenty-one".