21350425440 has 48 divisors (see below), whose sum is σ = 67253841648. Its totient is φ = 5693446656.

The previous prime is 21350425429. The next prime is 21350425507. The reversal of 21350425440 is 4452405312.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21350425398 and 21350425407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22239547 + ... + 22240506.

It is an arithmetic number, because the mean of its divisors is an integer number (1401121701).

Almost surely, 2^21350425440 is an apocalyptic number.

21350425440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21350425440 is an abundant number, since it is smaller than the sum of its proper divisors (45903416208).

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

21350425440 is a wasteful number, since it uses less digits than its factorization.

21350425440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44480071 (or 44480063 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21350425440 in words is "twenty-one billion, three hundred fifty million, four hundred twenty-five thousand, four hundred forty".