102021201220 has 48 divisors (see below), whose sum is σ = 215985913920. Its totient is φ = 40477781376.

The previous prime is 102021201211. The next prime is 102021201229. The reversal of 102021201220 is 22102120201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102021201211) and next prime (102021201229).

It is a self number, because there is not a number n which added to its sum of digits gives 102021201220.

It is not an unprimeable number, because it can be changed into a prime (102021201229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1628599 + ... + 1690081.

It is an arithmetic number, because the mean of its divisors is an integer number (4499706540).

Almost surely, 2^102021201220 is an apocalyptic number.

102021201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021201220 is an abundant number, since it is smaller than the sum of its proper divisors (113964712700).

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

102021201220 is a wasteful number, since it uses less digits than its factorization.

102021201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62164 (or 62162 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102021201220 its reverse (22102120201), we get a palindrome (124123321421).

The spelling of 102021201220 in words is "one hundred two billion, twenty-one million, two hundred one thousand, two hundred twenty".