21311411372 has 6 divisors (see below), whose sum is σ = 37294969908. Its totient is φ = 10655705684.

The previous prime is 21311411371. The next prime is 21311411437. The reversal of 21311411372 is 27311411312.

It is a super-2 number, since 2×21311411372² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21311411371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663926418 + ... + 2663926425.

It is an arithmetic number, because the mean of its divisors is an integer number (6215828318).

Almost surely, 2^21311411372 is an apocalyptic number.

It is an amenable number.

21311411372 is a deficient number, since it is larger than the sum of its proper divisors (15983558536).

21311411372 is a wasteful number, since it uses less digits than its factorization.

21311411372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327852847 (or 5327852845 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

Adding to 21311411372 its reverse (27311411312), we get a palindrome (48622822684).

The spelling of 21311411372 in words is "twenty-one billion, three hundred eleven million, four hundred eleven thousand, three hundred seventy-two".