21012101210210 has 24 divisors (see below), whose sum is σ = 41572702727388. Its totient is φ = 7640764076000.

The previous prime is 21012101210209. The next prime is 21012101210257. The reversal of 21012101210210 is 1201210121012.

It can be written as a sum of positive squares in 2 ways, for example, as 19363000916281 + 1649100293929 = 4400341^2 + 1284173^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8682685241 + ... + 8682687660.

Almost surely, 2^{21012101210210} is an apocalyptic number.

21012101210210 is a deficient number, since it is larger than the sum of its proper divisors (20560601517178).

21012101210210 is a wasteful number, since it uses less digits than its factorization.

21012101210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17365372930 (or 17365372919 counting only the distinct ones).

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

Adding to 21012101210210 its reverse (1201210121012), we get a palindrome (22213311331222).

The spelling of 21012101210210 in words is "twenty-one trillion, twelve billion, one hundred one million, two hundred ten thousand, two hundred ten".