21969025940 has 24 divisors (see below), whose sum is σ = 47207862240. Its totient is φ = 8583247008.

The previous prime is 21969025913. The next prime is 21969025963. The reversal of 21969025940 is 4952096912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12771830 + ... + 12773549.

It is an arithmetic number, because the mean of its divisors is an integer number (1966994260).

Almost surely, 2^21969025940 is an apocalyptic number.

21969025940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21969025940 is an abundant number, since it is smaller than the sum of its proper divisors (25238836300).

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

21969025940 is a wasteful number, since it uses less digits than its factorization.

21969025940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25545431 (or 25545429 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 21969025940 in words is "twenty-one billion, nine hundred sixty-nine million, twenty-five thousand, nine hundred forty".