1021021300021 has 16 divisors (see below), whose sum is σ = 1081487387200. Its totient is φ = 961246476288.

The previous prime is 1021021299989. The next prime is 1021021300063. The reversal of 1021021300021 is 1200031201201.

It is a cyclic number.

It is not a de Polignac number, because 1021021300021 - 2⁵ = 1021021299989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021021299974 and 1021021300010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021300121) 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 15 ways as a sum of consecutive naturals, for example, 1738741 + ... + 2250613.

It is an arithmetic number, because the mean of its divisors is an integer number (67592961700).

Almost surely, 2^{1021021300021} is an apocalyptic number.

It is an amenable number.

1021021300021 is a deficient number, since it is larger than the sum of its proper divisors (60466087179).

1021021300021 is a wasteful number, since it uses less digits than its factorization.

1021021300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512548.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1021021300021 its reverse (1200031201201), we get a palindrome (2221052501222).

The spelling of 1021021300021 in words is "one trillion, twenty-one billion, twenty-one million, three hundred thousand, twenty-one".