1021428593890 has 8 divisors (see below), whose sum is σ = 1838571469020. Its totient is φ = 408571437552.

The previous prime is 1021428593869. The next prime is 1021428593893. The reversal of 1021428593890 is 983958241201.

It can be written as a sum of positive squares in 2 ways, for example, as 993265377129 + 28163216761 = 996627^2 + 167819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1021428593890² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021428593893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51071429685 + ... + 51071429704.

Almost surely, 2^{1021428593890} is an apocalyptic number.

1021428593890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021428593890 is a deficient number, since it is larger than the sum of its proper divisors (817142875130).

1021428593890 is a wasteful number, since it uses less digits than its factorization.

1021428593890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102142859396.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 1021428593890 in words is "one trillion, twenty-one billion, four hundred twenty-eight million, five hundred ninety-three thousand, eight hundred ninety".