21203211110 has 32 divisors (see below), whose sum is σ = 38300502240. Its totient is φ = 8451387648.

The previous prime is 21203211109. The next prime is 21203211149. The reversal of 21203211110 is 1111230212.

It is a super-2 number, since 2×21203211110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 7768226 + ... + 7770954.

It is an arithmetic number, because the mean of its divisors is an integer number (1196890695).

Almost surely, 2^21203211110 is an apocalyptic number.

21203211110 is a deficient number, since it is larger than the sum of its proper divisors (17097291130).

21203211110 is a wasteful number, since it uses less digits than its factorization.

21203211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21203211110 its reverse (1111230212), we get a palindrome (22314441322).

The spelling of 21203211110 in words is "twenty-one billion, two hundred three million, two hundred eleven thousand, one hundred ten".