21243001210 has 16 divisors (see below), whose sum is σ = 38266816392. Its totient is φ = 8490664000.

The previous prime is 21243001201. The next prime is 21243001229. The reversal of 21243001210 is 1210034212.

It can be written as a sum of positive squares in 4 ways, for example, as 3790741761 + 17452259449 = 61569^2 + 132107^2 .

It is a super-2 number, since 2×21243001210² (a number of 21 digits) contains 22 as substring.

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, 803401 + ... + 829420.

Almost surely, 2^21243001210 is an apocalyptic number.

21243001210 is a deficient number, since it is larger than the sum of its proper divisors (17023815182).

21243001210 is a wasteful number, since it uses less digits than its factorization.

21243001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634129.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21243001210 its reverse (1210034212), we get a palindrome (22453035422).

The spelling of 21243001210 in words is "twenty-one billion, two hundred forty-three million, one thousand, two hundred ten".