21121221020010 has 16 divisors (see below), whose sum is σ = 50690930448096. Its totient is φ = 5632325605328.

The previous prime is 21121221019999. The next prime is 21121221020017. The reversal of 21121221020010 is 1002012212112.

It is a super-2 number, since 2×21121221020010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21121221020017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352020350304 + ... + 352020350363.

It is an arithmetic number, because the mean of its divisors is an integer number (3168183153006).

Almost surely, 2^{21121221020010} is an apocalyptic number.

21121221020010 is an abundant number, since it is smaller than the sum of its proper divisors (29569709428086).

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

21121221020010 is a wasteful number, since it uses less digits than its factorization.

21121221020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704040700677.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121221020010 its reverse (1002012212112), we get a palindrome (22123233232122).

The spelling of 21121221020010 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, ten".