21220210212120 has 64 divisors (see below), whose sum is σ = 70734034044000. Its totient is φ = 5658722722944.

The previous prime is 21220210212073. The next prime is 21220210212167. The reversal of 21220210212120 is 2121201202212.

It is a happy number.

21220210212120 is a `hidden beast` number, since 2 + 1 + 220 + 210 + 21 + 212 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21220210212073) and next prime (21220210212167).

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

It is a junction number, because it is equal to n+sod(n) for n = 21220210212093 and 21220210212102.

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, 9824170315 + ... + 9824172474.

Almost surely, 2^{21220210212120} is an apocalyptic number.

21220210212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220210212120 is an abundant number, since it is smaller than the sum of its proper divisors (49513823831880).

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

21220210212120 is a wasteful number, since it uses less digits than its factorization.

21220210212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19648342809 (or 19648342799 counting only the distinct ones).

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

Adding to 21220210212120 its reverse (2121201202212), we get a palindrome (23341411414332).

The spelling of 21220210212120 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, two hundred twelve thousand, one hundred twenty".