102021221210220 has 144 divisors (see below), whose sum is σ = 344761368456960. Its totient is φ = 24246953353728.

The previous prime is 102021221210219. The next prime is 102021221210287. The reversal of 102021221210220 is 22012122120201.

It is a happy number.

102021221210220 is a `hidden beast` number, since 1 + 0 + 2 + 0 + 212 + 21 + 210 + 220 = 666.

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 = 102021221210193 and 102021221210202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 751635804 + ... + 751771523.

It is an arithmetic number, because the mean of its divisors is an integer number (2394176169840).

Almost surely, 2^{102021221210220} is an apocalyptic number.

102021221210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021221210220 is an abundant number, since it is smaller than the sum of its proper divisors (242740147246740).

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

102021221210220 is a wasteful number, since it uses less digits than its factorization.

102021221210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503407384 (or 1503407379 counting only the distinct ones).

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

Adding to 102021221210220 its reverse (22012122120201), we get a palindrome (124033343330421).

The spelling of 102021221210220 in words is "one hundred two trillion, twenty-one billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty".