21029393020 has 12 divisors (see below), whose sum is σ = 44161725384. Its totient is φ = 8411757200.

The previous prime is 21029392991. The next prime is 21029393083. The reversal of 21029393020 is 2039392012.

It is a happy number.

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, 525734806 + ... + 525734845.

It is an arithmetic number, because the mean of its divisors is an integer number (3680143782).

Almost surely, 2^21029393020 is an apocalyptic number.

21029393020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21029393020 is an abundant number, since it is smaller than the sum of its proper divisors (23132332364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21029393020 is a wasteful number, since it uses less digits than its factorization.

21029393020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051469660 (or 1051469658 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The spelling of 21029393020 in words is "twenty-one billion, twenty-nine million, three hundred ninety-three thousand, twenty".