21106517053 has 8 divisors (see below), whose sum is σ = 21363402240. Its totient is φ = 20850070560.

The previous prime is 21106517041. The next prime is 21106517071. The reversal of 21106517053 is 35071560112.

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

It is a cyclic number.

It is not a de Polignac number, because 21106517053 - 2⁵ = 21106517021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106517353) 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, 12343 + ... + 205828.

It is an arithmetic number, because the mean of its divisors is an integer number (2670425280).

Almost surely, 2^21106517053 is an apocalyptic number.

It is an amenable number.

21106517053 is a deficient number, since it is larger than the sum of its proper divisors (256885187).

21106517053 is a wasteful number, since it uses less digits than its factorization.

21106517053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219347.

The product of its (nonzero) digits is 6300, while the sum is 31.

The spelling of 21106517053 in words is "twenty-one billion, one hundred six million, five hundred seventeen thousand, fifty-three".