2100987477 has 32 divisors (see below), whose sum is σ = 3227992320. Its totient is φ = 1366437600.

The previous prime is 2100987461. The next prime is 2100987617. The reversal of 2100987477 is 7747890012.

It is a happy number.

It is not a de Polignac number, because 2100987477 - 2⁴ = 2100987461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100987457) 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 31 ways as a sum of consecutive naturals, for example, 77952 + ... + 101382.

It is an arithmetic number, because the mean of its divisors is an integer number (100874760).

Almost surely, 2^2100987477 is an apocalyptic number.

2100987477 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2100987477 is a deficient number, since it is larger than the sum of its proper divisors (1127004843).

2100987477 is an frugal number, since it uses more digits than its factorization.

2100987477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23493 (or 23475 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 2100987477 is about 45836.5299406489. The cubic root of 2100987477 is about 1280.7798545615.

The spelling of 2100987477 in words is "two billion, one hundred million, nine hundred eighty-seven thousand, four hundred seventy-seven".