21221440412408 has 48 divisors (see below), whose sum is σ = 40852486656720. Its totient is φ = 10334597070336.

The previous prime is 21221440412407. The next prime is 21221440412411. The reversal of 21221440412408 is 80421404412212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221440412407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3189485 + ... + 7253667.

It is an arithmetic number, because the mean of its divisors is an integer number (851093472015).

Almost surely, 2^{21221440412408} is an apocalyptic number.

It is an amenable number.

21221440412408 is a deficient number, since it is larger than the sum of its proper divisors (19631046244312).

21221440412408 is a wasteful number, since it uses less digits than its factorization.

21221440412408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064628 (or 4064581 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 35.

The spelling of 21221440412408 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred forty million, four hundred twelve thousand, four hundred eight".