1000200021 has 16 divisors (see below), whose sum is σ = 1370582784. Its totient is φ = 648333504.

The previous prime is 1000200013. The next prime is 1000200029. The reversal of 1000200021 is 1200020001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1000200013) and next prime (1000200029).

It is not a de Polignac number, because 1000200021 - 2³ = 1000200013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000199982 and 1000200009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000200029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259716 + ... + 263538.

It is an arithmetic number, because the mean of its divisors is an integer number (85661424).

Almost surely, 2^1000200021 is an apocalyptic number.

It is an amenable number.

1000200021 is a deficient number, since it is larger than the sum of its proper divisors (370382763).

1000200021 is a wasteful number, since it uses less digits than its factorization.

1000200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6220.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1000200021 is about 31625.9390532518. The cubic root of 1000200021 is about 1000.0666692218.

Adding to 1000200021 its reverse (1200020001), we get a palindrome (2200220022).

The spelling of 1000200021 in words is "one billion, two hundred thousand, twenty-one".