21620155006 has 8 divisors (see below), whose sum is σ = 33120237600. Its totient is φ = 10580075808.

The previous prime is 21620154979. The next prime is 21620155013. The reversal of 21620155006 is 60055102612.

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

It is a super-2 number, since 2×21620155006² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115000731 + ... + 115000918.

It is an arithmetic number, because the mean of its divisors is an integer number (4140029700).

Almost surely, 2^21620155006 is an apocalyptic number.

21620155006 is a deficient number, since it is larger than the sum of its proper divisors (11500082594).

21620155006 is a wasteful number, since it uses less digits than its factorization.

21620155006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230001698.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21620155006 its reverse (60055102612), we get a palindrome (81675257618).

The spelling of 21620155006 in words is "twenty-one billion, six hundred twenty million, one hundred fifty-five thousand, six".