21221011010 has 16 divisors (see below), whose sum is σ = 38366096256. Its totient is φ = 8451009648.

The previous prime is 21221010997. The next prime is 21221011069. The reversal of 21221011010 is 1011012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221010982 and 21221011000.

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, 4671962 + ... + 4676501.

It is an arithmetic number, because the mean of its divisors is an integer number (2397881016).

Almost surely, 2^21221011010 is an apocalyptic number.

21221011010 is a deficient number, since it is larger than the sum of its proper divisors (17145085246).

21221011010 is a wasteful number, since it uses less digits than its factorization.

21221011010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348697.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21221011010 its reverse (1011012212), we get a palindrome (22232023222).

The spelling of 21221011010 in words is "twenty-one billion, two hundred twenty-one million, eleven thousand, ten".