102212576978 has 18 divisors (see below), whose sum is σ = 160291038789. Its totient is φ = 48879302472.

The previous prime is 102212576971. The next prime is 102212576987. The reversal of 102212576978 is 879675212201.

It can be written as a sum of positive squares in 2 ways, for example, as 80279855569 + 21932721409 = 283337^2 + 148097^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=226067.

It is a super-2 number, since 2×102212576978² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102212576971) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10394168 + ... + 10403996.

Almost surely, 2^102212576978 is an apocalyptic number.

102212576978 is a deficient number, since it is larger than the sum of its proper divisors (58078461811).

102212576978 is an frugal number, since it uses more digits than its factorization.

102212576978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19706 (or 9854 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

Multiplying 102212576978 by its sum of digits (50), we get a square (5110628848900 = 2260670²).

The spelling of 102212576978 in words is "one hundred two billion, two hundred twelve million, five hundred seventy-six thousand, nine hundred seventy-eight".