21111211002201 has 32 divisors (see below), whose sum is σ = 28755258225408. Its totient is φ = 13773591444480.

The previous prime is 21111211002197. The next prime is 21111211002209. The reversal of 21111211002201 is 10220011211112.

It is a happy number.

It is not a de Polignac number, because 21111211002201 - 2² = 21111211002197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111211002209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666857565 + ... + 666889221.

It is an arithmetic number, because the mean of its divisors is an integer number (898601819544).

Almost surely, 2^{21111211002201} is an apocalyptic number.

It is an amenable number.

21111211002201 is a deficient number, since it is larger than the sum of its proper divisors (7644047223207).

21111211002201 is a wasteful number, since it uses less digits than its factorization.

21111211002201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54721.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111211002201 its reverse (10220011211112), we get a palindrome (31331222213313).

The spelling of 21111211002201 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, two thousand, two hundred one".