21021003121210 has 16 divisors (see below), whose sum is σ = 37839147844392. Its totient is φ = 8408102976000.

The previous prime is 21021003121201. The next prime is 21021003121267. The reversal of 21021003121210 is 1212130012012.

It can be written as a sum of positive squares in 4 ways, for example, as 20818295167849 + 202707953361 = 4562707^2 + 450231^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36987951 + ... + 37551970.

Almost surely, 2^{21021003121210} is an apocalyptic number.

21021003121210 is a deficient number, since it is larger than the sum of its proper divisors (16818144723182).

21021003121210 is a wasteful number, since it uses less digits than its factorization.

21021003121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74568129.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21021003121210 its reverse (1212130012012), we get a palindrome (22233133133222).

The spelling of 21021003121210 in words is "twenty-one trillion, twenty-one billion, three million, one hundred twenty-one thousand, two hundred ten".