211220202031 has 2 divisors, whose sum is σ = 211220202032. Its totient is φ = 211220202030.

The previous prime is 211220202001. The next prime is 211220202059. The reversal of 211220202031 is 130202022112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211220202031 - 2¹³ = 211220193839 is a prime.

It is a super-2 number, since 2×211220202031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220201996 and 211220202014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220202001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610101015 + 105610101016.

It is an arithmetic number, because the mean of its divisors is an integer number (105610101016).

Almost surely, 2^211220202031 is an apocalyptic number.

211220202031 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220202031 is an equidigital number, since it uses as much as digits as its factorization.

211220202031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 211220202031 its reverse (130202022112), we get a palindrome (341422224143).

The spelling of 211220202031 in words is "two hundred eleven billion, two hundred twenty million, two hundred two thousand, thirty-one".