102102021002 has 4 divisors (see below), whose sum is σ = 153153031506. Its totient is φ = 51051010500.

The previous prime is 102102020981. The next prime is 102102021013. The reversal of 102102021002 is 200120201201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 97380819481 + 4721201521 = 312059^2 + 68711^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25525505249 + ... + 25525505252.

Almost surely, 2^102102021002 is an apocalyptic number.

102102021002 is a deficient number, since it is larger than the sum of its proper divisors (51051010504).

102102021002 is an equidigital number, since it uses as much as digits as its factorization.

102102021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51051010503.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102102021002 its reverse (200120201201), we get a palindrome (302222222203).

The spelling of 102102021002 in words is "one hundred two billion, one hundred two million, twenty-one thousand, two".