21121221000010 has 16 divisors (see below), whose sum is σ = 38018319667200. Its totient is φ = 8448461318416.

The previous prime is 21121220999981. The next prime is 21121221000017. The reversal of 21121221000010 is 1000012212112.

It is a super-2 number, since 2×21121221000010² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121221000017) 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, 57111 + ... + 6499669.

It is an arithmetic number, because the mean of its divisors is an integer number (2376144979200).

Almost surely, 2^{21121221000010} is an apocalyptic number.

21121221000010 is a deficient number, since it is larger than the sum of its proper divisors (16897098667190).

21121221000010 is a wasteful number, since it uses less digits than its factorization.

21121221000010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770405.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21121221000010 its reverse (1000012212112), we get a palindrome (22121233212122).

The spelling of 21121221000010 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, ten", and thus it is an aban number.