21211201210 has 16 divisors (see below), whose sum is σ = 38806067592. Its totient is φ = 8345390400.

The previous prime is 21211201139. The next prime is 21211201337. The reversal of 21211201210 is 1210211212.

21211201210 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5651882041 + 15559319169 = 75179^2 + 124737^2 .

It is a super-2 number, since 2×21211201210² (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, 17385621 + ... + 17386840.

Almost surely, 2^21211201210 is an apocalyptic number.

21211201210 is a deficient number, since it is larger than the sum of its proper divisors (17594866382).

21211201210 is a wasteful number, since it uses less digits than its factorization.

21211201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34772529.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211201210 its reverse (1210211212), we get a palindrome (22421412422).

The spelling of 21211201210 in words is "twenty-one billion, two hundred eleven million, two hundred one thousand, two hundred ten".