21112101210 has 64 divisors (see below), whose sum is σ = 53832988800. Its totient is φ = 5288838912.

The previous prime is 21112101209. The next prime is 21112101217. The reversal of 21112101210 is 1210121112.

It is not an unprimeable number, because it can be changed into a prime (21112101217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295740 + ... + 360119.

It is an arithmetic number, because the mean of its divisors is an integer number (841140450).

Almost surely, 2^21112101210 is an apocalyptic number.

21112101210 is an abundant number, since it is smaller than the sum of its proper divisors (32720887590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112101210 is a wasteful number, since it uses less digits than its factorization.

21112101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655935.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21112101210 its reverse (1210121112), we get a palindrome (22322222322).

The spelling of 21112101210 in words is "twenty-one billion, one hundred twelve million, one hundred one thousand, two hundred ten".