21220212199931 has 2 divisors, whose sum is σ = 21220212199932. Its totient is φ = 21220212199930.

The previous prime is 21220212199919. The next prime is 21220212200003. The reversal of 21220212199931 is 13999121202212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220212199931 - 2⁶ = 21220212199867 is a prime.

It is a super-2 number, since 2×21220212199931² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220212129931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610106099965 + 10610106099966.

It is an arithmetic number, because the mean of its divisors is an integer number (10610106099966).

Almost surely, 2^{21220212199931} is an apocalyptic number.

21220212199931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220212199931 is an equidigital number, since it uses as much as digits as its factorization.

21220212199931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 21220212199931 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, one hundred ninety-nine thousand, nine hundred thirty-one".