21920262853381 has 2 divisors, whose sum is σ = 21920262853382. Its totient is φ = 21920262853380.

The previous prime is 21920262853367. The next prime is 21920262853439. The reversal of 21920262853381 is 18335826202912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11953676993281 + 9966585860100 = 3457409^2 + 3156990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21920262853381 is a prime.

It is a super-2 number, since 2×21920262853381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21920262853351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10960131426690 + 10960131426691.

It is an arithmetic number, because the mean of its divisors is an integer number (10960131426691).

Almost surely, 2^{21920262853381} is an apocalyptic number.

It is an amenable number.

21920262853381 is a deficient number, since it is larger than the sum of its proper divisors (1).

21920262853381 is an equidigital number, since it uses as much as digits as its factorization.

21920262853381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 21920262853381 in words is "twenty-one trillion, nine hundred twenty billion, two hundred sixty-two million, eight hundred fifty-three thousand, three hundred eighty-one".