21001220201010 has 64 divisors (see below), whose sum is σ = 57603971158272. Its totient is φ = 4800226876416.

The previous prime is 21001220200993. The next prime is 21001220201023. The reversal of 21001220201010 is 1010202210012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20893902 + ... + 21875958.

It is an arithmetic number, because the mean of its divisors is an integer number (900062049348).

Almost surely, 2^{21001220201010} is an apocalyptic number.

21001220201010 is an abundant number, since it is smaller than the sum of its proper divisors (36602750957262).

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

21001220201010 is a wasteful number, since it uses less digits than its factorization.

21001220201010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083907.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21001220201010 its reverse (1010202210012), we get a palindrome (22011422411022).

The spelling of 21001220201010 in words is "twenty-one trillion, one billion, two hundred twenty million, two hundred one thousand, ten".