21011111210202 has 64 divisors (see below), whose sum is σ = 44078841667584. Its totient is φ = 6669029090880.

The previous prime is 21011111210191. The next prime is 21011111210237. The reversal of 21011111210202 is 20201211111012.

It is a happy number.

It is an unprimeable number.

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, 210122077 + ... + 210222047.

It is an arithmetic number, because the mean of its divisors is an integer number (688731901056).

Almost surely, 2^{21011111210202} is an apocalyptic number.

21011111210202 is an abundant number, since it is smaller than the sum of its proper divisors (23067730457382).

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

21011111210202 is a wasteful number, since it uses less digits than its factorization.

21011111210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120203.

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

Adding to 21011111210202 its reverse (20201211111012), we get a palindrome (41212322321214).

The spelling of 21011111210202 in words is "twenty-one trillion, eleven billion, one hundred eleven million, two hundred ten thousand, two hundred two".