1021000021007 has 2 divisors, whose sum is σ = 1021000021008. Its totient is φ = 1021000021006.

The previous prime is 1021000020991. The next prime is 1021000021087. The reversal of 1021000021007 is 7001200001201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021000021007 - 2⁴ = 1021000020991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021000020982 and 1021000021000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021000021087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510500010503 + 510500010504.

It is an arithmetic number, because the mean of its divisors is an integer number (510500010504).

Almost surely, 2^{1021000021007} is an apocalyptic number.

1021000021007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021000021007 is an equidigital number, since it uses as much as digits as its factorization.

1021000021007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

Adding to 1021000021007 its reverse (7001200001201), we get a palindrome (8022200022208).

The spelling of 1021000021007 in words is "one trillion, twenty-one billion, twenty-one thousand, seven".