21177034216 has 48 divisors (see below), whose sum is σ = 44185421700. Its totient is φ = 9458680320.

The previous prime is 21177034213. The next prime is 21177034273. The reversal of 21177034216 is 61243077112.

It can be written as a sum of positive squares in 2 ways, for example, as 20636471716 + 540562500 = 143654^2 + 23250^2 .

It is not an unprimeable number, because it can be changed into a prime (21177034213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6001 + ... + 205888.

Almost surely, 2^21177034216 is an apocalyptic number.

21177034216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21177034216 is an abundant number, since it is smaller than the sum of its proper divisors (23008387484).

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

21177034216 is a wasteful number, since it uses less digits than its factorization.

21177034216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211970 (or 211935 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 21177034216 in words is "twenty-one billion, one hundred seventy-seven million, thirty-four thousand, two hundred sixteen".