21001202211 has 32 divisors (see below), whose sum is σ = 30889527552. Its totient is φ = 12585896960.

The previous prime is 21001202207. The next prime is 21001202267. The reversal of 21001202211 is 11220210012.

It is a cyclic number.

It is not a de Polignac number, because 21001202211 - 2² = 21001202207 is a prime.

It is a super-2 number, since 2×21001202211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21001202011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1645591 + ... + 1658303.

It is an arithmetic number, because the mean of its divisors is an integer number (965297736).

Almost surely, 2^21001202211 is an apocalyptic number.

21001202211 is a deficient number, since it is larger than the sum of its proper divisors (9888325341).

21001202211 is a wasteful number, since it uses less digits than its factorization.

21001202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13283.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21001202211 its reverse (11220210012), we get a palindrome (32221412223).

The spelling of 21001202211 in words is "twenty-one billion, one million, two hundred two thousand, two hundred eleven".