21210210022210 has 64 divisors (see below), whose sum is σ = 43090687929600. Its totient is φ = 7445916576000.

The previous prime is 21210210022103. The next prime is 21210210022217. The reversal of 21210210022210 is 1222001201212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21210210022217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25431811 + ... + 26252569.

It is an arithmetic number, because the mean of its divisors is an integer number (673291998900).

Almost surely, 2^{21210210022210} is an apocalyptic number.

21210210022210 is an abundant number, since it is smaller than the sum of its proper divisors (21880477907390).

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

21210210022210 is a wasteful number, since it uses less digits than its factorization.

21210210022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828907.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210210022210 its reverse (1222001201212), we get a palindrome (22432211223422).

The spelling of 21210210022210 in words is "twenty-one trillion, two hundred ten billion, two hundred ten million, twenty-two thousand, two hundred ten".