121572021106 has 4 divisors (see below), whose sum is σ = 182358031662. Its totient is φ = 60786010552.

The previous prime is 121572021083. The next prime is 121572021139. The reversal of 121572021106 is 601120275121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601120275121 = 29 ⋅20728285349.

It can be written as a sum of positive squares in only one way, i.e., 60937391025 + 60634630081 = 246855^2 + 246241^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30393005275 + ... + 30393005278.

Almost surely, 2^121572021106 is an apocalyptic number.

121572021106 is a deficient number, since it is larger than the sum of its proper divisors (60786010556).

121572021106 is an equidigital number, since it uses as much as digits as its factorization.

121572021106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60786010555.

The product of its (nonzero) digits is 1680, while the sum is 28.

Adding to 121572021106 its reverse (601120275121), we get a palindrome (722692296227).

The spelling of 121572021106 in words is "one hundred twenty-one billion, five hundred seventy-two million, twenty-one thousand, one hundred six".