102021121220 has 24 divisors (see below), whose sum is σ = 214299048600. Its totient is φ = 40798030592.

The previous prime is 102021121171. The next prime is 102021121247. The reversal of 102021121220 is 22121120201.

It can be written as a sum of positive squares in 4 ways, for example, as 7166976964 + 94854144256 = 84658^2 + 307984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102021121195 and 102021121204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570575 + ... + 727734.

It is an arithmetic number, because the mean of its divisors is an integer number (8929127025).

Almost surely, 2^102021121220 is an apocalyptic number.

102021121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021121220 is an abundant number, since it is smaller than the sum of its proper divisors (112277927380).

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

102021121220 is a wasteful number, since it uses less digits than its factorization.

102021121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302247 (or 1302245 counting only the distinct ones).

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

Adding to 102021121220 its reverse (22121120201), we get a palindrome (124142241421).

The spelling of 102021121220 in words is "one hundred two billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty".