21010012210 has 32 divisors (see below), whose sum is σ = 41288113152. Its totient is φ = 7634062080.

The previous prime is 21010012201. The next prime is 21010012271. The reversal of 21010012210 is 1221001012.

It is a super-2 number, since 2×21010012210² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 69039 + ... + 216301.

It is an arithmetic number, because the mean of its divisors is an integer number (1290253536).

Almost surely, 2^21010012210 is an apocalyptic number.

21010012210 is a deficient number, since it is larger than the sum of its proper divisors (20278100942).

21010012210 is a wasteful number, since it uses less digits than its factorization.

21010012210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148578.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010012210 its reverse (1221001012), we get a palindrome (22231013222).

The spelling of 21010012210 in words is "twenty-one billion, ten million, twelve thousand, two hundred ten".