21220613876 has 48 divisors (see below), whose sum is σ = 47058571392. Its totient is φ = 8132227200.

The previous prime is 21220613867. The next prime is 21220613891. The reversal of 21220613876 is 67831602212.

It is a happy number.

It is a congruent number.

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, 545951 + ... + 583526.

It is an arithmetic number, because the mean of its divisors is an integer number (980386904).

Almost surely, 2^21220613876 is an apocalyptic number.

It is an amenable number.

21220613876 is an abundant number, since it is smaller than the sum of its proper divisors (25837957516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220613876 is a wasteful number, since it uses less digits than its factorization.

21220613876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129560 (or 1129558 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 21220613876 in words is "twenty-one billion, two hundred twenty million, six hundred thirteen thousand, eight hundred seventy-six".