21021220100210 has 32 divisors (see below), whose sum is σ = 41278794868800. Its totient is φ = 7643938800960.

The previous prime is 21021220100189. The next prime is 21021220100273. The reversal of 21021220100210 is 1200102212012.

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, 4309736 + ... + 7785644.

It is an arithmetic number, because the mean of its divisors is an integer number (1289962339650).

Almost surely, 2^{21021220100210} is an apocalyptic number.

21021220100210 is a deficient number, since it is larger than the sum of its proper divisors (20257574768590).

21021220100210 is a wasteful number, since it uses less digits than its factorization.

21021220100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530906.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021220100210 its reverse (1200102212012), we get a palindrome (22221322312222).

The spelling of 21021220100210 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, one hundred thousand, two hundred ten".