21020311303427 has 2 divisors, whose sum is σ = 21020311303428. Its totient is φ = 21020311303426.

The previous prime is 21020311303309. The next prime is 21020311303471. The reversal of 21020311303427 is 72430311302012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020311303427 - 2³⁸ = 20745433396483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21020311303427.

It is not a weakly prime, because it can be changed into another prime (21020311309427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510155651713 + 10510155651714.

It is an arithmetic number, because the mean of its divisors is an integer number (10510155651714).

Almost surely, 2^{21020311303427} is an apocalyptic number.

21020311303427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020311303427 is an equidigital number, since it uses as much as digits as its factorization.

21020311303427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

Adding to 21020311303427 its reverse (72430311302012), we get a palindrome (93450622605439).

The spelling of 21020311303427 in words is "twenty-one trillion, twenty billion, three hundred eleven million, three hundred three thousand, four hundred twenty-seven".