21004152020397 has 256 divisors, whose sum is σ = 40709794406400. Its totient is φ = 10386670694400.

The previous prime is 21004152020393. The next prime is 21004152020419. The reversal of 21004152020397 is 79302025140012.

21004152020397 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 41 + 520 + 2 + 0 + 3 + 97 = 666.

It is not a de Polignac number, because 21004152020397 - 2² = 21004152020393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004152020393) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 19984920522 + ... + 19984921572.

It is an arithmetic number, because the mean of its divisors is an integer number (159022634400).

Almost surely, 2^{21004152020397} is an apocalyptic number.

21004152020397 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21004152020397 is a deficient number, since it is larger than the sum of its proper divisors (19705642386003).

21004152020397 is a wasteful number, since it uses less digits than its factorization.

21004152020397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513 (or 2507 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21004152020397 in words is "twenty-one trillion, four billion, one hundred fifty-two million, twenty thousand, three hundred ninety-seven".