21244207347621 has 48 divisors (see below), whose sum is σ = 32407585726464. Its totient is φ = 13383849976992.

The previous prime is 21244207347617. The next prime is 21244207347659. The reversal of 21244207347621 is 12674370244212.

21244207347621 is a `hidden beast` number, since 2 + 1 + 2 + 44 + 207 + 347 + 62 + 1 = 666.

It is not a de Polignac number, because 21244207347621 - 2² = 21244207347617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244207347521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6821940 + ... + 9435426.

It is an arithmetic number, because the mean of its divisors is an integer number (675158035968).

Almost surely, 2^{21244207347621} is an apocalyptic number.

It is an amenable number.

21244207347621 is a deficient number, since it is larger than the sum of its proper divisors (11163378378843).

21244207347621 is a wasteful number, since it uses less digits than its factorization.

21244207347621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613990 (or 2613987 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 45.

The spelling of 21244207347621 in words is "twenty-one trillion, two hundred forty-four billion, two hundred seven million, three hundred forty-seven thousand, six hundred twenty-one".