20213311312021 has 2 divisors, whose sum is σ = 20213311312022. Its totient is φ = 20213311312020.

The previous prime is 20213311312001. The next prime is 20213311312027. The reversal of 20213311312021 is 12021311331202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20026072502500 + 187238809521 = 4475050^2 + 432711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213311312021 - 2¹⁵ = 20213311279253 is a prime.

It is a super-2 number, since 2×20213311312021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20213311311983 and 20213311312001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213311312027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106655656010 + 10106655656011.

It is an arithmetic number, because the mean of its divisors is an integer number (10106655656011).

Almost surely, 2^{20213311312021} is an apocalyptic number.

It is an amenable number.

20213311312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213311312021 is an equidigital number, since it uses as much as digits as its factorization.

20213311312021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20213311312021 its reverse (12021311331202), we get a palindrome (32234622643223).

The spelling of 20213311312021 in words is "twenty trillion, two hundred thirteen billion, three hundred eleven million, three hundred twelve thousand, twenty-one".