21371612 has 6 divisors (see below), whose sum is σ = 37400328. Its totient is φ = 10685804.

The previous prime is 21371591. The next prime is 21371627. The reversal of 21371612 is 21617312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2671448 + ... + 2671455.

It is an arithmetic number, because the mean of its divisors is an integer number (6233388).

Almost surely, 2^21371612 is an apocalyptic number.

It is an amenable number.

21371612 is a deficient number, since it is larger than the sum of its proper divisors (16028716).

21371612 is a wasteful number, since it uses less digits than its factorization.

21371612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5342907 (or 5342905 counting only the distinct ones).

The product of its digits is 504, while the sum is 23.

The square root of 21371612 is about 4622.9440835900. The cubic root of 21371612 is about 277.5102915319.

Adding to 21371612 its reverse (21617312), we get a palindrome (42988924).

The spelling of 21371612 in words is "twenty-one million, three hundred seventy-one thousand, six hundred twelve".