21065212676 has 48 divisors (see below), whose sum is σ = 41887843200. Its totient is φ = 9215281152.

The previous prime is 21065212667. The next prime is 21065212717. The reversal of 21065212676 is 67621256012.

It is a super-2 number, since 2×21065212676² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157085 + ... + 258468.

It is an arithmetic number, because the mean of its divisors is an integer number (872663400).

Almost surely, 2^21065212676 is an apocalyptic number.

It is an amenable number.

21065212676 is a deficient number, since it is larger than the sum of its proper divisors (20822630524).

21065212676 is a wasteful number, since it uses less digits than its factorization.

21065212676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415628 (or 415626 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 21065212676 its reverse (67621256012), we get a palindrome (88686468688).

The spelling of 21065212676 in words is "twenty-one billion, sixty-five million, two hundred twelve thousand, six hundred seventy-six".