21200351031011 has 2 divisors, whose sum is σ = 21200351031012. Its totient is φ = 21200351031010.

The previous prime is 21200351030959. The next prime is 21200351031023. The reversal of 21200351031011 is 11013015300212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21200351031011 - 2¹⁴ = 21200351014627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21200351031511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600175515505 + 10600175515506.

It is an arithmetic number, because the mean of its divisors is an integer number (10600175515506).

Almost surely, 2^{21200351031011} is an apocalyptic number.

21200351031011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200351031011 is an equidigital number, since it uses as much as digits as its factorization.

21200351031011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 21200351031011 its reverse (11013015300212), we get a palindrome (32213366331223).

The spelling of 21200351031011 in words is "twenty-one trillion, two hundred billion, three hundred fifty-one million, thirty-one thousand, eleven".