21029629493 has 8 divisors (see below), whose sum is σ = 22784496768. Its totient is φ = 19332298944.

The previous prime is 21029629477. The next prime is 21029629501. The reversal of 21029629493 is 39492692012.

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 21029629493 - 2⁴ = 21029629477 is a prime.

It is a super-2 number, since 2×21029629493² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21029629793) 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, 14383421 + ... + 14384882.

It is an arithmetic number, because the mean of its divisors is an integer number (2848062096).

Almost surely, 2^21029629493 is an apocalyptic number.

It is an amenable number.

21029629493 is a deficient number, since it is larger than the sum of its proper divisors (1754867275).

21029629493 is a wasteful number, since it uses less digits than its factorization.

21029629493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28768363.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 21029629493 in words is "twenty-one billion, twenty-nine million, six hundred twenty-nine thousand, four hundred ninety-three".