53213532221 has 2 divisors, whose sum is σ = 53213532222. Its totient is φ = 53213532220.

The previous prime is 53213532193. The next prime is 53213532287. The reversal of 53213532221 is 12223531235.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44041639321 + 9171892900 = 209861^2 + 95770^2 .

It is a cyclic number.

It is not a de Polignac number, because 53213532221 - 2⁶ = 53213532157 is a prime.

It is a super-2 number, since 2×53213532221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53213532721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26606766110 + 26606766111.

It is an arithmetic number, because the mean of its divisors is an integer number (26606766111).

Almost surely, 2^53213532221 is an apocalyptic number.

It is an amenable number.

53213532221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53213532221 is an equidigital number, since it uses as much as digits as its factorization.

53213532221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 29.

The spelling of 53213532221 in words is "fifty-three billion, two hundred thirteen million, five hundred thirty-two thousand, two hundred twenty-one".