21111210221202 has 12 divisors (see below), whose sum is σ = 45740955479310. Its totient is φ = 7037070073728.

The previous prime is 21111210221173. The next prime is 21111210221237. The reversal of 21111210221202 is 20212201211112.

21111210221202 is a `hidden beast` number, since 21 + 1 + 11 + 210 + 221 + 202 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19972398964401 + 1138811256801 = 4469049^2 + 1067151^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1172845012289 = 21111210221202 / (2 + 1 + 1 + 1 + 1 + 2 + 1 + 0 + 2 + 2 + 1 + 2 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586422506127 + ... + 586422506162.

Almost surely, 2^{21111210221202} is an apocalyptic number.

21111210221202 is an abundant number, since it is smaller than the sum of its proper divisors (24629745258108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111210221202 is a wasteful number, since it uses less digits than its factorization.

21111210221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172845012297 (or 1172845012294 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21111210221202 its reverse (20212201211112), we get a palindrome (41323411432314).

The spelling of 21111210221202 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, two hundred twenty-one thousand, two hundred two".