21620537007406 has 8 divisors (see below), whose sum is σ = 33307313768280. Its totient is φ = 10518099084648.

The previous prime is 21620537007347. The next prime is 21620537007439. The reversal of 21620537007406 is 60470073502612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21620537007406³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146084709436 + ... + 146084709583.

It is an arithmetic number, because the mean of its divisors is an integer number (4163414221035).

Almost surely, 2^{21620537007406} is an apocalyptic number.

21620537007406 is a deficient number, since it is larger than the sum of its proper divisors (11686776760874).

21620537007406 is a wasteful number, since it uses less digits than its factorization.

21620537007406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292169419058.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 21620537007406 in words is "twenty-one trillion, six hundred twenty billion, five hundred thirty-seven million, seven thousand, four hundred six".