21002122002212 has 12 divisors (see below), whose sum is σ = 39580922235036. Its totient is φ = 9693287077920.

The previous prime is 21002122002193. The next prime is 21002122002233. The reversal of 21002122002212 is 21220022120012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1338431492836 + 19663690509376 = 1156906^2 + 4434376^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201943480739 + ... + 201943480842.

It is an arithmetic number, because the mean of its divisors is an integer number (3298410186253).

Almost surely, 2^{21002122002212} is an apocalyptic number.

It is an amenable number.

21002122002212 is a deficient number, since it is larger than the sum of its proper divisors (18578800232824).

21002122002212 is a wasteful number, since it uses less digits than its factorization.

21002122002212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403886961598 (or 403886961596 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002122002212 its reverse (21220022120012), we get a palindrome (42222144122224).

The spelling of 21002122002212 in words is "twenty-one trillion, two billion, one hundred twenty-two million, two thousand, two hundred twelve".