21011032001 has 4 divisors (see below), whose sum is σ = 21018013104. Its totient is φ = 21004050900.

The previous prime is 21011031997. The next prime is 21011032027. The reversal of 21011032001 is 10023011012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21011032001 - 2² = 21011031997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011032501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3486035 + ... + 3492056.

It is an arithmetic number, because the mean of its divisors is an integer number (5254503276).

Almost surely, 2^21011032001 is an apocalyptic number.

It is an amenable number.

21011032001 is a deficient number, since it is larger than the sum of its proper divisors (6981103).

21011032001 is an equidigital number, since it uses as much as digits as its factorization.

21011032001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981102.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21011032001 its reverse (10023011012), we get a palindrome (31034043013).

The spelling of 21011032001 in words is "twenty-one billion, eleven million, thirty-two thousand, one".