21424043400 has 96 divisors (see below), whose sum is σ = 68209592640. Its totient is φ = 5558664960.

The previous prime is 21424043371. The next prime is 21424043429. The reversal of 21424043400 is 434042412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21424043371) and next prime (21424043429).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 460324 + ... + 504723.

It is an arithmetic number, because the mean of its divisors is an integer number (710516590).

Almost surely, 2^21424043400 is an apocalyptic number.

21424043400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424043400 is an abundant number, since it is smaller than the sum of its proper divisors (46785549240).

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

21424043400 is a wasteful number, since it uses less digits than its factorization.

21424043400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965103 (or 965094 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21424043400 its reverse (434042412), we get a palindrome (21858085812).

The spelling of 21424043400 in words is "twenty-one billion, four hundred twenty-four million, forty-three thousand, four hundred".