1021211977 has 2 divisors, whose sum is σ = 1021211978. Its totient is φ = 1021211976.

The previous prime is 1021211929. The next prime is 1021212007. The reversal of 1021211977 is 7791121201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942428601 + 78783376 = 30699^2 + 8876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021211977 - 2¹⁵ = 1021179209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021211377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510605988 + 510605989.

It is an arithmetic number, because the mean of its divisors is an integer number (510605989).

Almost surely, 2^1021211977 is an apocalyptic number.

It is an amenable number.

1021211977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021211977 is an equidigital number, since it uses as much as digits as its factorization.

1021211977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 31.

The square root of 1021211977 is about 31956.4074482724. The cubic root of 1021211977 is about 1007.0212457309.

The spelling of 1021211977 in words is "one billion, twenty-one million, two hundred eleven thousand, nine hundred seventy-seven".