21401847420 has 24 divisors (see below), whose sum is σ = 59925172944. Its totient is φ = 5707159296.

The previous prime is 21401847391. The next prime is 21401847449. The reversal of 21401847420 is 2474810412.

It is an interprime number because it is at equal distance from previous prime (21401847391) and next prime (21401847449).

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, 178348669 + ... + 178348788.

It is an arithmetic number, because the mean of its divisors is an integer number (2496882206).

Almost surely, 2^21401847420 is an apocalyptic number.

21401847420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401847420 is an abundant number, since it is smaller than the sum of its proper divisors (38523325524).

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

21401847420 is a wasteful number, since it uses less digits than its factorization.

21401847420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356697469 (or 356697467 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The spelling of 21401847420 in words is "twenty-one billion, four hundred one million, eight hundred forty-seven thousand, four hundred twenty".