21677803242 has 16 divisors (see below), whose sum is σ = 43358892192. Its totient is φ = 7225386800.

The previous prime is 21677803229. The next prime is 21677803307. The reversal of 21677803242 is 24230877612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21677803194 and 21677803203.

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, 46548 + ... + 213359.

It is an arithmetic number, because the mean of its divisors is an integer number (2709930762).

Almost surely, 2^21677803242 is an apocalyptic number.

21677803242 is an abundant number, since it is smaller than the sum of its proper divisors (21681088950).

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

21677803242 is a wasteful number, since it uses less digits than its factorization.

21677803242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273813.

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 21677803242 in words is "twenty-one billion, six hundred seventy-seven million, eight hundred three thousand, two hundred forty-two".