21248897400 has 384 divisors, whose sum is σ = 77352192000. Its totient is φ = 5352721920.

The previous prime is 21248897389. The next prime is 21248897413. The reversal of 21248897400 is 479884212.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7358757 + ... + 7361643.

It is an arithmetic number, because the mean of its divisors is an integer number (201438000).

Almost surely, 2^21248897400 is an apocalyptic number.

21248897400 is a gapful number since it is divisible by the number (20) 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 21248897400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38676096000).

21248897400 is an abundant number, since it is smaller than the sum of its proper divisors (56103294600).

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

21248897400 is a wasteful number, since it uses less digits than its factorization.

21248897400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2988 (or 2973 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 21248897400 in words is "twenty-one billion, two hundred forty-eight million, eight hundred ninety-seven thousand, four hundred".