21060020606 has 4 divisors (see below), whose sum is σ = 31590030912. Its totient is φ = 10530010302.

The previous prime is 21060020591. The next prime is 21060020621. The reversal of 21060020606 is 60602006012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21060020591) and next prime (21060020621).

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, 5265005150 + ... + 5265005153.

It is an arithmetic number, because the mean of its divisors is an integer number (7897507728).

Almost surely, 2^21060020606 is an apocalyptic number.

21060020606 is a deficient number, since it is larger than the sum of its proper divisors (10530010306).

21060020606 is a wasteful number, since it uses less digits than its factorization.

21060020606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10530010305.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21060020606 its reverse (60602006012), we get a palindrome (81662026618).

The spelling of 21060020606 in words is "twenty-one billion, sixty million, twenty thousand, six hundred six".