21201212011210 has 128 divisors (see below), whose sum is σ = 48141867276288. Its totient is φ = 6530220000000.

The previous prime is 21201212011171. The next prime is 21201212011211. The reversal of 21201212011210 is 1211021210212.

It is not an unprimeable number, because it can be changed into a prime (21201212011211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40413085 + ... + 40934335.

It is an arithmetic number, because the mean of its divisors is an integer number (376108338096).

Almost surely, 2^{21201212011210} is an apocalyptic number.

21201212011210 is an abundant number, since it is smaller than the sum of its proper divisors (26940655265078).

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

21201212011210 is a wasteful number, since it uses less digits than its factorization.

21201212011210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521900.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201212011210 its reverse (1211021210212), we get a palindrome (22412233221422).

The spelling of 21201212011210 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, eleven thousand, two hundred ten".