20211012281 has 2 divisors, whose sum is σ = 20211012282. Its totient is φ = 20211012280.

The previous prime is 20211012277. The next prime is 20211012293. The reversal of 20211012281 is 18221011202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20189852281 + 21160000 = 142091^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211012281 - 2² = 20211012277 is a prime.

It is a super-2 number, since 2×20211012281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20211012271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105506140 + 10105506141.

It is an arithmetic number, because the mean of its divisors is an integer number (10105506141).

Almost surely, 2^20211012281 is an apocalyptic number.

It is an amenable number.

20211012281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211012281 is an equidigital number, since it uses as much as digits as its factorization.

20211012281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20211012281 its reverse (18221011202), we get a palindrome (38432023483).

The spelling of 20211012281 in words is "twenty billion, two hundred eleven million, twelve thousand, two hundred eighty-one".