21439769148 has 120 divisors (see below), whose sum is σ = 66839764992. Its totient is φ = 5859301536.

The previous prime is 21439769111. The next prime is 21439769161. The reversal of 21439769148 is 84196793412.

21439769148 is a `hidden beast` number, since 2 + 1 + 439 + 7 + 69 + 148 = 666.

It is a super-2 number, since 2×21439769148² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 21439769094 and 21439769103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 153340 + ... + 257667.

Almost surely, 2^21439769148 is an apocalyptic number.

21439769148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21439769148 is an abundant number, since it is smaller than the sum of its proper divisors (45399995844).

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

21439769148 is a wasteful number, since it uses less digits than its factorization.

21439769148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411053 (or 411042 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 21439769148 in words is "twenty-one billion, four hundred thirty-nine million, seven hundred sixty-nine thousand, one hundred forty-eight".