1029428633921 has 2 divisors, whose sum is σ = 1029428633922. Its totient is φ = 1029428633920.

The previous prime is 1029428633887. The next prime is 1029428634001. The reversal of 1029428633921 is 1293368249201.

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., 534711937600 + 494716696321 = 731240^2 + 703361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1029428633921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1029428633921.

It is not a weakly prime, because it can be changed into another prime (1029428633521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514714316960 + 514714316961.

It is an arithmetic number, because the mean of its divisors is an integer number (514714316961).

Almost surely, 2^{1029428633921} is an apocalyptic number.

It is an amenable number.

1029428633921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1029428633921 is an equidigital number, since it uses as much as digits as its factorization.

1029428633921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 1029428633921 in words is "one trillion, twenty-nine billion, four hundred twenty-eight million, six hundred thirty-three thousand, nine hundred twenty-one".