10001200021 has 8 divisors (see below), whose sum is σ = 10239801440. Its totient is φ = 9762872112.

The previous prime is 10001199961. The next prime is 10001200057. The reversal of 10001200021 is 12000210001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001200021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001199977 and 10001200013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001200091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6595 + ... + 141583.

It is an arithmetic number, because the mean of its divisors is an integer number (1279975180).

Almost surely, 2^10001200021 is an apocalyptic number.

It is an amenable number.

10001200021 is a deficient number, since it is larger than the sum of its proper divisors (238601419).

10001200021 is a wasteful number, since it uses less digits than its factorization.

10001200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136755.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10001200021 its reverse (12000210001), we get a palindrome (22001410022).

It can be divided in two parts, 1000 and 1200021, that added together give a palindrome (1201021).

The spelling of 10001200021 in words is "ten billion, one million, two hundred thousand, twenty-one".