21077036020 has 48 divisors (see below), whose sum is σ = 44700155136. Its totient is φ = 8347680000.

The previous prime is 21077036003. The next prime is 21077036023. The reversal of 21077036020 is 2063077012.

It is a self number, because there is not a number n which added to its sum of digits gives 21077036020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077036023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 928000 + ... + 950440.

It is an arithmetic number, because the mean of its divisors is an integer number (931253232).

Almost surely, 2^21077036020 is an apocalyptic number.

21077036020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21077036020 is an abundant number, since it is smaller than the sum of its proper divisors (23623119116).

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

21077036020 is a wasteful number, since it uses less digits than its factorization.

21077036020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22912 (or 22910 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The spelling of 21077036020 in words is "twenty-one billion, seventy-seven million, thirty-six thousand, twenty".