1021231129901 has 2 divisors, whose sum is σ = 1021231129902. Its totient is φ = 1021231129900.

The previous prime is 1021231129889. The next prime is 1021231129927. The reversal of 1021231129901 is 1099211321201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718257945001 + 302973184900 = 847501^2 + 550430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021231129901 - 2¹⁴ = 1021231113517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021231129931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510615564950 + 510615564951.

It is an arithmetic number, because the mean of its divisors is an integer number (510615564951).

Almost surely, 2^{1021231129901} is an apocalyptic number.

It is an amenable number.

1021231129901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021231129901 is an equidigital number, since it uses as much as digits as its factorization.

1021231129901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 1021231129901 in words is "one trillion, twenty-one billion, two hundred thirty-one million, one hundred twenty-nine thousand, nine hundred one".