21244973040 has 120 divisors (see below), whose sum is σ = 74449833120. Its totient is φ = 5419003392.

The previous prime is 21244973027. The next prime is 21244973053. The reversal of 21244973040 is 4037944212.

21244973040 is a `hidden beast` number, since 2 + 124 + 497 + 3 + 0 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (21244973027) and next prime (21244973053).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21244972986 and 21244973004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 624895 + ... + 658014.

It is an arithmetic number, because the mean of its divisors is an integer number (620415276).

Almost surely, 2^21244973040 is an apocalyptic number.

21244973040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21244973040 is an abundant number, since it is smaller than the sum of its proper divisors (53204860080).

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

21244973040 is a wasteful number, since it uses less digits than its factorization.

21244973040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282951 (or 1282942 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 21244973040 in words is "twenty-one billion, two hundred forty-four million, nine hundred seventy-three thousand, forty".