121220111221610 has 16 divisors (see below), whose sum is σ = 218196821039400. Its totient is φ = 48487906524096.

The previous prime is 121220111221607. The next prime is 121220111221633. The reversal of 121220111221610 is 16122111022121.

It can be written as a sum of positive squares in 4 ways, for example, as 121144781283241 + 75329938369 = 11006579^2 + 274463^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13516925 + ... + 20619104.

Almost surely, 2^{121220111221610} is an apocalyptic number.

121220111221610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121220111221610 is a deficient number, since it is larger than the sum of its proper divisors (96976709817790).

121220111221610 is a wasteful number, since it uses less digits than its factorization.

121220111221610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34491145.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 121220111221610 its reverse (16122111022121), we get a palindrome (137342222243731).

The spelling of 121220111221610 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, six hundred ten".