202102012211989 has 2 divisors, whose sum is σ = 202102012211990. Its totient is φ = 202102012211988.

The previous prime is 202102012211951. The next prime is 202102012212073. The reversal of 202102012211989 is 989112210201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194038854427089 + 8063157784900 = 13929783^2 + 2839570^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102012211989 - 2²³ = 202102003823381 is a prime.

It is a super-2 number, since 2×202102012211989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202102012211189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101051006105994 + 101051006105995.

It is an arithmetic number, because the mean of its divisors is an integer number (101051006105995).

Almost surely, 2^{202102012211989} is an apocalyptic number.

It is an amenable number.

202102012211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

202102012211989 is an equidigital number, since it uses as much as digits as its factorization.

202102012211989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 202102012211989 in words is "two hundred two trillion, one hundred two billion, twelve million, two hundred eleven thousand, nine hundred eighty-nine".