11211400021 has 8 divisors (see below), whose sum is σ = 11486311704. Its totient is φ = 10936558080.

The previous prime is 11211400003. The next prime is 11211400027. The reversal of 11211400021 is 12000411211.

It can be written as a sum of positive squares in 4 ways, for example, as 3236016996 + 7975383025 = 56886^2 + 89305^2 .

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 11211400021 - 2²⁵ = 11177845589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211399974 and 11211400010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211400027) 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, 478635 + ... + 501511.

It is an arithmetic number, because the mean of its divisors is an integer number (1435788963).

Almost surely, 2^11211400021 is an apocalyptic number.

It is an amenable number.

11211400021 is a deficient number, since it is larger than the sum of its proper divisors (274911683).

11211400021 is a wasteful number, since it uses less digits than its factorization.

11211400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34871.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11211400021 its reverse (12000411211), we get a palindrome (23211811232).

The spelling of 11211400021 in words is "eleven billion, two hundred eleven million, four hundred thousand, twenty-one".