21221365126040 has 64 divisors (see below), whose sum is σ = 47869852068000. Its totient is φ = 8466898585600.

The previous prime is 21221365126009. The next prime is 21221365126063. The reversal of 21221365126040 is 4062156312212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459025646 + ... + 459071874.

Almost surely, 2^{21221365126040} is an apocalyptic number.

21221365126040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221365126040 is an abundant number, since it is smaller than the sum of its proper divisors (26648486941960).

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

21221365126040 is a wasteful number, since it uses less digits than its factorization.

21221365126040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75260 (or 75256 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21221365126040 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-five million, one hundred twenty-six thousand, forty".