21021113001 has 16 divisors (see below), whose sum is σ = 32034597248. Its totient is φ = 12011155200.

The previous prime is 21021112951. The next prime is 21021113017. The reversal of 21021113001 is 10031112012.

It is not a de Polignac number, because 21021113001 - 2⁷ = 21021112873 is a prime.

It is a super-2 number, since 2×21021113001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021113401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328491 + ... + 387231.

It is an arithmetic number, because the mean of its divisors is an integer number (2002162328).

Almost surely, 2^21021113001 is an apocalyptic number.

21021113001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21021113001 is a deficient number, since it is larger than the sum of its proper divisors (11013484247).

21021113001 is a wasteful number, since it uses less digits than its factorization.

21021113001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75792.

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

Adding to 21021113001 its reverse (10031112012), we get a palindrome (31052225013).

The spelling of 21021113001 in words is "twenty-one billion, twenty-one million, one hundred thirteen thousand, one".