102021221252 has 12 divisors (see below), whose sum is σ = 179462201436. Its totient is φ = 50746306560.

The previous prime is 102021221251. The next prime is 102021221261. The reversal of 102021221252 is 252122120201.

It can be written as a sum of positive squares in 2 ways, for example, as 71190777856 + 30830443396 = 266816^2 + 175586^2 .

It is not an unprimeable number, because it can be changed into a prime (102021221251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66075149 + ... + 66076692.

It is an arithmetic number, because the mean of its divisors is an integer number (14955183453).

Almost surely, 2^102021221252 is an apocalyptic number.

It is an amenable number.

102021221252 is a deficient number, since it is larger than the sum of its proper divisors (77440980184).

102021221252 is a wasteful number, since it uses less digits than its factorization.

102021221252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132152038 (or 132152036 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 102021221252 its reverse (252122120201), we get a palindrome (354143341453).

The spelling of 102021221252 in words is "one hundred two billion, twenty-one million, two hundred twenty-one thousand, two hundred fifty-two".