21121102021010 has 16 divisors (see below), whose sum is σ = 38018224675800. Its totient is φ = 8448387244416.

The previous prime is 21121102020989. The next prime is 21121102021039. The reversal of 21121102021010 is 1012020112112.

It can be written as a sum of positive squares in 4 ways, for example, as 20137234427209 + 983867593801 = 4487453^2 + 991901^2 .

It is a super-2 number, since 2×21121102021010² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5019395 + ... + 8211974.

Almost surely, 2^{21121102021010} is an apocalyptic number.

21121102021010 is a deficient number, since it is larger than the sum of its proper divisors (16897122654790).

21121102021010 is a wasteful number, since it uses less digits than its factorization.

21121102021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13391005.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121102021010 its reverse (1012020112112), we get a palindrome (22133122133122).

The spelling of 21121102021010 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, twenty-one thousand, ten".