102121378 has 8 divisors (see below), whose sum is σ = 158123520. Its totient is φ = 49413540.

The previous prime is 102121373. The next prime is 102121387. The reversal of 102121378 is 873121201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (102121373) 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, 823498 + ... + 823621.

It is an arithmetic number, because the mean of its divisors is an integer number (19765440).

Almost surely, 2^102121378 is an apocalyptic number.

102121378 is a deficient number, since it is larger than the sum of its proper divisors (56002142).

102121378 is a wasteful number, since it uses less digits than its factorization.

102121378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647152.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 102121378 is about 10105.5122581688. The cubic root of 102121378 is about 467.4181320224.

Adding to 102121378 its reverse (873121201), we get a palindrome (975242579).

The spelling of 102121378 in words is "one hundred two million, one hundred twenty-one thousand, three hundred seventy-eight".