21210202011 has 8 divisors (see below), whose sum is σ = 29044601104. Its totient is φ = 13757968800.

The previous prime is 21210202007. The next prime is 21210202019. The reversal of 21210202011 is 11020201212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21210202011 - 2² = 21210202007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210202019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95541340 + ... + 95541561.

It is an arithmetic number, because the mean of its divisors is an integer number (3630575138).

Almost surely, 2^21210202011 is an apocalyptic number.

21210202011 is a deficient number, since it is larger than the sum of its proper divisors (7834399093).

21210202011 is a wasteful number, since it uses less digits than its factorization.

21210202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191082941.

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

Adding to 21210202011 its reverse (11020201212), we get a palindrome (32230403223).

The spelling of 21210202011 in words is "twenty-one billion, two hundred ten million, two hundred two thousand, eleven".