102021512 has 8 divisors (see below), whose sum is σ = 191290350. Its totient is φ = 51010752.

The previous prime is 102021511. The next prime is 102021541. The reversal of 102021512 is 215120201.

It can be written as a sum of positive squares in only one way, i.e., 99480676 + 2540836 = 9974^2 + 1594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×102021512² = 20816777821532288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102021511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6376337 + ... + 6376352.

Almost surely, 2^102021512 is an apocalyptic number.

It is an amenable number.

102021512 is a deficient number, since it is larger than the sum of its proper divisors (89268838).

102021512 is a wasteful number, since it uses less digits than its factorization.

102021512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12752695 (or 12752691 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 102021512 is about 10100.5698849124. The cubic root of 102021512 is about 467.2657173030.

Adding to 102021512 its reverse (215120201), we get a palindrome (317141713).

The spelling of 102021512 in words is "one hundred two million, twenty-one thousand, five hundred twelve".