21001210120210 has 8 divisors (see below), whose sum is σ = 37802178216396. Its totient is φ = 8400484048080.

The previous prime is 21001210120207. The next prime is 21001210120223. The reversal of 21001210120210 is 1202101210012.

It can be written as a sum of positive squares in 2 ways, for example, as 20484250558209 + 516959562001 = 4525953^2 + 718999^2 .

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

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, 1050060506001 + ... + 1050060506020.

Almost surely, 2^{21001210120210} is an apocalyptic number.

21001210120210 is a deficient number, since it is larger than the sum of its proper divisors (16800968096186).

21001210120210 is a wasteful number, since it uses less digits than its factorization.

21001210120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100121012028.

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

Adding to 21001210120210 its reverse (1202101210012), we get a palindrome (22203311330222).

The spelling of 21001210120210 in words is "twenty-one trillion, one billion, two hundred ten million, one hundred twenty thousand, two hundred ten".