21221011001210 has 16 divisors (see below), whose sum is σ = 38197958896800. Its totient is φ = 8488373490576.

The previous prime is 21221011001173. The next prime is 21221011001213. The reversal of 21221011001210 is 1210011012212.

It is not an unprimeable number, because it can be changed into a prime (21221011001213) 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, 869780 + ... + 6572559.

It is an arithmetic number, because the mean of its divisors is an integer number (2387372431050).

Almost surely, 2^{21221011001210} is an apocalyptic number.

21221011001210 is a deficient number, since it is larger than the sum of its proper divisors (16976947895590).

21221011001210 is a wasteful number, since it uses less digits than its factorization.

21221011001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7727485.

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

Adding to 21221011001210 its reverse (1210011012212), we get a palindrome (22431022013422).

The spelling of 21221011001210 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one thousand, two hundred ten".