21021212220102 has 48 divisors (see below), whose sum is σ = 45609411418272. Its totient is φ = 6997315113600.

The previous prime is 21021212220091. The next prime is 21021212220199. The reversal of 21021212220102 is 20102221212012.

It is a happy number.

21021212220102 is a `hidden beast` number, since 210 + 21 + 212 + 220 + 1 + 0 + 2 = 666.

It is a super-3 number, since 3×21021212220102³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40954852 + ... + 41464952.

It is an arithmetic number, because the mean of its divisors is an integer number (950196071214).

Almost surely, 2^{21021212220102} is an apocalyptic number.

21021212220102 is an abundant number, since it is smaller than the sum of its proper divisors (24588199198170).

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

21021212220102 is a wasteful number, since it uses less digits than its factorization.

21021212220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513293 (or 513290 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21021212220102 its reverse (20102221212012), we get a palindrome (41123433432114).

The spelling of 21021212220102 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred two".