21220120020010 has 8 divisors (see below), whose sum is σ = 38196216036036. Its totient is φ = 8488048008000.

The previous prime is 21220120019977. The next prime is 21220120020013. The reversal of 21220120020010 is 1002002102212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20860658618409 + 359461401601 = 4567347^2 + 599551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21220120020013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061006000991 + ... + 1061006001010.

Almost surely, 2^{21220120020010} is an apocalyptic number.

21220120020010 is a deficient number, since it is larger than the sum of its proper divisors (16976096016026).

21220120020010 is a wasteful number, since it uses less digits than its factorization.

21220120020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122012002008.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220120020010 its reverse (1002002102212), we get a palindrome (22222122122222).

The spelling of 21220120020010 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, twenty thousand, ten".