21020120101210 has 32 divisors (see below), whose sum is σ = 41559230597760. Its totient is φ = 7619192273088.

The previous prime is 21020120101199. The next prime is 21020120101217. The reversal of 21020120101210 is 1210102102012.

It is not an unprimeable number, because it can be changed into a prime (21020120101217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2405043697 + ... + 2405052436.

It is an arithmetic number, because the mean of its divisors is an integer number (1298725956180).

Almost surely, 2^{21020120101210} is an apocalyptic number.

21020120101210 is a deficient number, since it is larger than the sum of its proper divisors (20539110496550).

21020120101210 is a wasteful number, since it uses less digits than its factorization.

21020120101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810096182.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21020120101210 its reverse (1210102102012), we get a palindrome (22230222203222).

The spelling of 21020120101210 in words is "twenty-one trillion, twenty billion, one hundred twenty million, one hundred one thousand, two hundred ten".