1021020005 has 8 divisors (see below), whose sum is σ = 1289709600. Its totient is φ = 773825616.

The previous prime is 1021019977. The next prime is 1021020019. The reversal of 1021020005 is 5000201201.

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

It is not a de Polignac number, because 1021020005 - 2⁶ = 1021019941 is a prime.

It is a super-2 number, since 2×1021020005² = 2084963701220400050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5373695 + ... + 5373884.

It is an arithmetic number, because the mean of its divisors is an integer number (161213700).

Almost surely, 2^1021020005 is an apocalyptic number.

It is an amenable number.

1021020005 is a deficient number, since it is larger than the sum of its proper divisors (268689595).

1021020005 is a wasteful number, since it uses less digits than its factorization.

1021020005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10747603.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1021020005 is about 31953.4036528192. The cubic root of 1021020005 is about 1006.9581403221.

Adding to 1021020005 its reverse (5000201201), we get a palindrome (6021221206).

The spelling of 1021020005 in words is "one billion, twenty-one million, twenty thousand, five".