21177462340 has 12 divisors (see below), whose sum is σ = 44472670956. Its totient is φ = 8470984928.

The previous prime is 21177462269. The next prime is 21177462347. The reversal of 21177462340 is 4326477112.

It can be written as a sum of positive squares in 2 ways, for example, as 14200535556 + 6976926784 = 119166^2 + 83528^2 .

It is a super-2 number, since 2×21177462340² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21177462340.

It is not an unprimeable number, because it can be changed into a prime (21177462347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529436539 + ... + 529436578.

It is an arithmetic number, because the mean of its divisors is an integer number (3706055913).

Almost surely, 2^21177462340 is an apocalyptic number.

21177462340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21177462340 is an abundant number, since it is smaller than the sum of its proper divisors (23295208616).

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

21177462340 is a wasteful number, since it uses less digits than its factorization.

21177462340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058873126 (or 1058873124 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The spelling of 21177462340 in words is "twenty-one billion, one hundred seventy-seven million, four hundred sixty-two thousand, three hundred forty".