21211200121010 has 8 divisors (see below), whose sum is σ = 38180160217836. Its totient is φ = 8484480048400.

The previous prime is 21211200120911. The next prime is 21211200121019. The reversal of 21211200121010 is 1012100211212.

It can be written as a sum of positive squares in 2 ways, for example, as 17905025233489 + 3306174887521 = 4231433^2 + 1818289^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21211200121019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060560006041 + ... + 1060560006060.

Almost surely, 2^{21211200121010} is an apocalyptic number.

21211200121010 is a deficient number, since it is larger than the sum of its proper divisors (16968960096826).

21211200121010 is a wasteful number, since it uses less digits than its factorization.

21211200121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121120012108.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211200121010 its reverse (1012100211212), we get a palindrome (22223300332222).

The spelling of 21211200121010 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, one hundred twenty-one thousand, ten".