21774701877820 has 12 divisors (see below), whose sum is σ = 45726873943464. Its totient is φ = 8709880751120.

The previous prime is 21774701877751. The next prime is 21774701877827. The reversal of 21774701877820 is 2877810747712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774701877827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544367546926 + ... + 544367546965.

It is an arithmetic number, because the mean of its divisors is an integer number (3810572828622).

Almost surely, 2^{21774701877820} is an apocalyptic number.

21774701877820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21774701877820 is an abundant number, since it is smaller than the sum of its proper divisors (23952172065644).

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

21774701877820 is a wasteful number, since it uses less digits than its factorization.

21774701877820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088735093900 (or 1088735093898 counting only the distinct ones).

The product of its (nonzero) digits is 17210368, while the sum is 61.

The spelling of 21774701877820 in words is "twenty-one trillion, seven hundred seventy-four billion, seven hundred one million, eight hundred seventy-seven thousand, eight hundred twenty".