10780021820 has 12 divisors (see below), whose sum is σ = 22638045864. Its totient is φ = 4312008720.

The previous prime is 10780021807. The next prime is 10780021829. The reversal of 10780021820 is 2812008701.

It is a super-2 number, since 2×10780021820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10780021829) 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, 269500526 + ... + 269500565.

It is an arithmetic number, because the mean of its divisors is an integer number (1886503822).

Almost surely, 2^10780021820 is an apocalyptic number.

10780021820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10780021820 is an abundant number, since it is smaller than the sum of its proper divisors (11858024044).

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

10780021820 is a wasteful number, since it uses less digits than its factorization.

10780021820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539001100 (or 539001098 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The spelling of 10780021820 in words is "ten billion, seven hundred eighty million, twenty-one thousand, eight hundred twenty".