21253235072061 has 8 divisors (see below), whose sum is σ = 29251764400384. Its totient is φ = 13711764562560.

The previous prime is 21253235072051. The next prime is 21253235072063. The reversal of 21253235072061 is 16027053235212.

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

It is not a de Polignac number, because 21253235072061 - 2¹⁰ = 21253235071037 is a prime.

It is a super-3 number, since 3×21253235072061³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253235072063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114264704596 + ... + 114264704781.

It is an arithmetic number, because the mean of its divisors is an integer number (3656470550048).

Almost surely, 2^{21253235072061} is an apocalyptic number.

It is an amenable number.

21253235072061 is a deficient number, since it is larger than the sum of its proper divisors (7998529328323).

21253235072061 is a wasteful number, since it uses less digits than its factorization.

21253235072061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228529409411.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21253235072061 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-five million, seventy-two thousand, sixty-one".