120421209977 has 2 divisors, whose sum is σ = 120421209978. Its totient is φ = 120421209976.

The previous prime is 120421209973. The next prime is 120421210043. The reversal of 120421209977 is 779902124021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63748170256 + 56673039721 = 252484^2 + 238061^2 .

It is a cyclic number.

It is not a de Polignac number, because 120421209977 - 2² = 120421209973 is a prime.

It is not a weakly prime, because it can be changed into another prime (120421209973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60210604988 + 60210604989.

It is an arithmetic number, because the mean of its divisors is an integer number (60210604989).

Almost surely, 2^120421209977 is an apocalyptic number.

It is an amenable number.

120421209977 is a deficient number, since it is larger than the sum of its proper divisors (1).

120421209977 is an equidigital number, since it uses as much as digits as its factorization.

120421209977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 120421209977 in words is "one hundred twenty billion, four hundred twenty-one million, two hundred nine thousand, nine hundred seventy-seven".