21020699534 has 8 divisors (see below), whose sum is σ = 32901964560. Its totient is φ = 10053378016.

The previous prime is 21020699521. The next prime is 21020699587. The reversal of 21020699534 is 43599602012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21020699491 and 21020699500.

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, 228485819 + ... + 228485910.

It is an arithmetic number, because the mean of its divisors is an integer number (4112745570).

Almost surely, 2^21020699534 is an apocalyptic number.

21020699534 is a deficient number, since it is larger than the sum of its proper divisors (11881265026).

21020699534 is a wasteful number, since it uses less digits than its factorization.

21020699534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456971754.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 21020699534 in words is "twenty-one billion, twenty million, six hundred ninety-nine thousand, five hundred thirty-four".