21210023202210 has 48 divisors (see below), whose sum is σ = 56636494397496. Its totient is φ = 5503141154304.

The previous prime is 21210023202197. The next prime is 21210023202259. The reversal of 21210023202210 is 1220232001212.

21210023202210 is a `hidden beast` number, since 2 + 1 + 210 + 0 + 232 + 0 + 221 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20746102834521 + 463920367689 = 4554789^2 + 681117^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 3184684839 + ... + 3184691498.

Almost surely, 2^{21210023202210} is an apocalyptic number.

21210023202210 is an abundant number, since it is smaller than the sum of its proper divisors (35426471195286).

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

21210023202210 is a wasteful number, since it uses less digits than its factorization.

21210023202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369376387 (or 6369376384 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21210023202210 its reverse (1220232001212), we get a palindrome (22430255203422).

The spelling of 21210023202210 in words is "twenty-one trillion, two hundred ten billion, twenty-three million, two hundred two thousand, two hundred ten".