21377773040 has 40 divisors (see below), whose sum is σ = 53526657408. Its totient is φ = 7893331200.

The previous prime is 21377773007. The next prime is 21377773049. The reversal of 21377773040 is 4037777312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377773049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10276736 + ... + 10278815.

Almost surely, 2^21377773040 is an apocalyptic number.

21377773040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21377773040 is an abundant number, since it is smaller than the sum of its proper divisors (32148884368).

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

21377773040 is a wasteful number, since it uses less digits than its factorization.

21377773040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20555577 (or 20555571 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 41.

The spelling of 21377773040 in words is "twenty-one billion, three hundred seventy-seven million, seven hundred seventy-three thousand, forty".