21121020220010 has 8 divisors (see below), whose sum is σ = 38017836396036. Its totient is φ = 8448408088000.

The previous prime is 21121020220007. The next prime is 21121020220033. The reversal of 21121020220010 is 1002202012112.

It can be written as a sum of positive squares in 2 ways, for example, as 20772711328681 + 348308891329 = 4557709^2 + 590177^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056051010991 + ... + 1056051011010.

Almost surely, 2^{21121020220010} is an apocalyptic number.

21121020220010 is a deficient number, since it is larger than the sum of its proper divisors (16896816176026).

21121020220010 is a wasteful number, since it uses less digits than its factorization.

21121020220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112102022008.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21121020220010 its reverse (1002202012112), we get a palindrome (22123222232122).

The spelling of 21121020220010 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twenty thousand, ten".