21101736940 has 48 divisors (see below), whose sum is σ = 45304515648. Its totient is φ = 8253050624.

The previous prime is 21101736907. The next prime is 21101736941. The reversal of 21101736940 is 4963710112.

It is a junction number, because it is equal to n+sod(n) for n = 21101736896 and 21101736905.

It is not an unprimeable number, because it can be changed into a prime (21101736941) 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, 276609 + ... + 344551.

It is an arithmetic number, because the mean of its divisors is an integer number (943844076).

Almost surely, 2^21101736940 is an apocalyptic number.

21101736940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101736940 is an abundant number, since it is smaller than the sum of its proper divisors (24202778708).

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

21101736940 is a wasteful number, since it uses less digits than its factorization.

21101736940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68298 (or 68296 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 21101736940 in words is "twenty-one billion, one hundred one million, seven hundred thirty-six thousand, nine hundred forty".