21011002001210 has 48 divisors (see below), whose sum is σ = 42985474720776. Its totient is φ = 7349597444736.

The previous prime is 21011002001147. The next prime is 21011002001251. The reversal of 21011002001210 is 1210020011012.

It can be written as a sum of positive squares in 4 ways, for example, as 11026457413321 + 9984544587889 = 3320611^2 + 3159833^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011002001191 and 21011002001200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223807769 + ... + 223901628.

Almost surely, 2^{21011002001210} is an apocalyptic number.

21011002001210 is an abundant number, since it is smaller than the sum of its proper divisors (21974472719566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011002001210 is a wasteful number, since it uses less digits than its factorization.

21011002001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447709455 (or 447709436 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011002001210 its reverse (1210020011012), we get a palindrome (22221022012222).

The spelling of 21011002001210 in words is "twenty-one trillion, eleven billion, two million, one thousand, two hundred ten".