21002012311 has 8 divisors (see below), whose sum is σ = 25265578880. Its totient is φ = 17054265528.

The previous prime is 21002012281. The next prime is 21002012321. The reversal of 21002012311 is 11321020012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002012311 - 2⁹ = 21002011799 is a prime.

It is a super-2 number, since 2×21002012311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002012291 and 21002012300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002012321) 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, 78954801 + ... + 78955066.

It is an arithmetic number, because the mean of its divisors is an integer number (3158197360).

Almost surely, 2^21002012311 is an apocalyptic number.

21002012311 is a deficient number, since it is larger than the sum of its proper divisors (4263566569).

21002012311 is a wasteful number, since it uses less digits than its factorization.

21002012311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157909893.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21002012311 its reverse (11321020012), we get a palindrome (32323032323).

The spelling of 21002012311 in words is "twenty-one billion, two million, twelve thousand, three hundred eleven".