21699240948 has 216 divisors, whose sum is σ = 70564777920. Its totient is φ = 5558595840.

The previous prime is 21699240931. The next prime is 21699240971. The reversal of 21699240948 is 84904299612.

It is a junction number, because it is equal to n+sod(n) for n = 21699240894 and 21699240903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1408833 + ... + 1424151.

Almost surely, 2^21699240948 is an apocalyptic number.

21699240948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21699240948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35282388960).

21699240948 is an abundant number, since it is smaller than the sum of its proper divisors (48865536972).

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

21699240948 is a wasteful number, since it uses less digits than its factorization.

21699240948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15427 (or 15415 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 21699240948 in words is "twenty-one billion, six hundred ninety-nine million, two hundred forty thousand, nine hundred forty-eight".