21021011221202 has 16 divisors (see below), whose sum is σ = 31616407681560. Its totient is φ = 10482242450688.

The previous prime is 21021011221169. The next prime is 21021011221211. The reversal of 21021011221202 is 20212211012012.

It can be written as a sum of positive squares in 4 ways, for example, as 3359929326121 + 17661081895081 = 1833011^2 + 4202509^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7202327 + ... + 9691002.

Almost surely, 2^{21021011221202} is an apocalyptic number.

21021011221202 is a deficient number, since it is larger than the sum of its proper divisors (10595396460358).

21021011221202 is a wasteful number, since it uses less digits than its factorization.

21021011221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16895005.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021011221202 its reverse (20212211012012), we get a palindrome (41233222233214).

The spelling of 21021011221202 in words is "twenty-one trillion, twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred two".