21877756006 has 16 divisors (see below), whose sum is σ = 33026686704. Its totient is φ = 10868896224.

The previous prime is 21877755959. The next prime is 21877756007. The reversal of 21877756006 is 60065777812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21877756007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779376 + ... + 1791628.

It is an arithmetic number, because the mean of its divisors is an integer number (2064167919).

Almost surely, 2^21877756006 is an apocalyptic number.

21877756006 is a deficient number, since it is larger than the sum of its proper divisors (11148930698).

21877756006 is a wasteful number, since it uses less digits than its factorization.

21877756006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17895.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 21877756006 in words is "twenty-one billion, eight hundred seventy-seven million, seven hundred fifty-six thousand, six".