21121202010 has 64 divisors (see below), whose sum is σ = 51081120000. Its totient is φ = 5589043200.

The previous prime is 21121201991. The next prime is 21121202021. The reversal of 21121202010 is 1020212112.

It is a super-2 number, since 2×21121202010² (a number of 21 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 5656104 + ... + 5659836.

It is an arithmetic number, because the mean of its divisors is an integer number (798142500).

Almost surely, 2^21121202010 is an apocalyptic number.

21121202010 is an abundant number, since it is smaller than the sum of its proper divisors (29959917990).

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

21121202010 is a wasteful number, since it uses less digits than its factorization.

21121202010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21121202010 its reverse (1020212112), we get a palindrome (22141414122).

The spelling of 21121202010 in words is "twenty-one billion, one hundred twenty-one million, two hundred two thousand, ten".