21021123323210 has 32 divisors (see below), whose sum is σ = 39582587941200. Its totient is φ = 8027283658240.

The previous prime is 21021123323201. The next prime is 21021123323273. The reversal of 21021123323210 is 1232332112012.

It can be written as a sum of positive squares in 8 ways, for example, as 9400803641329 + 11620319681881 = 3066073^2 + 3408859^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407202461 + ... + 407254080.

Almost surely, 2^{21021123323210} is an apocalyptic number.

21021123323210 is a deficient number, since it is larger than the sum of its proper divisors (18561464617990).

21021123323210 is a wasteful number, since it uses less digits than its factorization.

21021123323210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814456666.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21021123323210 its reverse (1232332112012), we get a palindrome (22253455435222).

The spelling of 21021123323210 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred ten".