21412077556 has 24 divisors (see below), whose sum is σ = 38681907264. Its totient is φ = 10364511360.

The previous prime is 21412077523. The next prime is 21412077601. The reversal of 21412077556 is 65577021412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531400 + ... + 570271.

It is an arithmetic number, because the mean of its divisors is an integer number (1611746136).

Almost surely, 2^21412077556 is an apocalyptic number.

It is an amenable number.

21412077556 is a deficient number, since it is larger than the sum of its proper divisors (17269829708).

21412077556 is a wasteful number, since it uses less digits than its factorization.

21412077556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101831 (or 1101829 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

Adding to 21412077556 its reverse (65577021412), we get a palindrome (86989098968).

The spelling of 21412077556 in words is "twenty-one billion, four hundred twelve million, seventy-seven thousand, five hundred fifty-six".