1001000202021 has 24 divisors (see below), whose sum is σ = 1547785044000. Its totient is φ = 621495212832.

The previous prime is 1001000202017. The next prime is 1001000202067. The reversal of 1001000202021 is 1202020001001.

It is not a de Polignac number, because 1001000202021 - 2² = 1001000202017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001000201994 and 1001000202012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001000202001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49598406 + ... + 49618583.

It is an arithmetic number, because the mean of its divisors is an integer number (64491043500).

Almost surely, 2^{1001000202021} is an apocalyptic number.

It is an amenable number.

1001000202021 is a deficient number, since it is larger than the sum of its proper divisors (546784841979).

1001000202021 is a wasteful number, since it uses less digits than its factorization.

1001000202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99217073 (or 99217070 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1001000202021 its reverse (1202020001001), we get a palindrome (2203020203022).

It can be divided in two parts, 1001000 and 202021, that added together give a palindrome (1203021).

The spelling of 1001000202021 in words is "one trillion, one billion, two hundred two thousand, twenty-one".