21049378332 has 12 divisors (see below), whose sum is σ = 49115216136. Its totient is φ = 7016459440.

The previous prime is 21049378331. The next prime is 21049378411. The reversal of 21049378332 is 23387394012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21049378332² (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 (21049378331) 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, 877057419 + ... + 877057442.

It is an arithmetic number, because the mean of its divisors is an integer number (4092934678).

Almost surely, 2^21049378332 is an apocalyptic number.

It is an amenable number.

21049378332 is an abundant number, since it is smaller than the sum of its proper divisors (28065837804).

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

21049378332 is a wasteful number, since it uses less digits than its factorization.

21049378332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754114868 (or 1754114866 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 21049378332 in words is "twenty-one billion, forty-nine million, three hundred seventy-eight thousand, three hundred thirty-two".