211221212002051 has 2 divisors, whose sum is σ = 211221212002052. Its totient is φ = 211221212002050.

The previous prime is 211221212001997. The next prime is 211221212002117. The reversal of 211221212002051 is 150200212122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211221212002051 - 2¹⁹ = 211221211477763 is a prime.

It is a super-2 number, since 2×211221212002051² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211221212102051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610606001025 + 105610606001026.

It is an arithmetic number, because the mean of its divisors is an integer number (105610606001026).

Almost surely, 2^{211221212002051} is an apocalyptic number.

211221212002051 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221212002051 is an equidigital number, since it uses as much as digits as its factorization.

211221212002051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 211221212002051 its reverse (150200212122112), we get a palindrome (361421424124163).

The spelling of 211221212002051 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two thousand, fifty-one".