102121111010 has 16 divisors (see below), whose sum is σ = 184170826872. Its totient is φ = 40770038400.

The previous prime is 102121111007. The next prime is 102121111019. The reversal of 102121111010 is 10111121201.

It can be written as a sum of positive squares in 4 ways, for example, as 94880632729 + 7240478281 = 308027^2 + 85091^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102121110982 and 102121111000.

It is not an unprimeable number, because it can be changed into a prime (102121111019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9795281 + ... + 9805700.

Almost surely, 2^102121111010 is an apocalyptic number.

102121111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102121111010 is a deficient number, since it is larger than the sum of its proper divisors (82049715862).

102121111010 is a wasteful number, since it uses less digits than its factorization.

102121111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19601509.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 102121111010 its reverse (10111121201), we get a palindrome (112232232211).

The spelling of 102121111010 in words is "one hundred two billion, one hundred twenty-one million, one hundred eleven thousand, ten".