21212001001210 has 32 divisors (see below), whose sum is σ = 38223798560784. Its totient is φ = 8475427200000.

The previous prime is 21212001001201. The next prime is 21212001001249. The reversal of 21212001001210 is 1210010021212.

It can be written as a sum of positive squares in 8 ways, for example, as 7031496979809 + 14180504021401 = 2651697^2 + 3765701^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44210400 + ... + 44687620.

Almost surely, 2^{21212001001210} is an apocalyptic number.

21212001001210 is a deficient number, since it is larger than the sum of its proper divisors (17011797559574).

21212001001210 is a wasteful number, since it uses less digits than its factorization.

21212001001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212001001210 its reverse (1210010021212), we get a palindrome (22422011022422).

The spelling of 21212001001210 in words is "twenty-one trillion, two hundred twelve billion, one million, one thousand, two hundred ten".