21430127020 has 72 divisors (see below), whose sum is σ = 46769108400. Its totient is φ = 8247864960.

The previous prime is 21430127011. The next prime is 21430127023. The reversal of 21430127020 is 2072103412.

It is a junction number, because it is equal to n+sod(n) for n = 21430126982 and 21430127000.

It is not an unprimeable number, because it can be changed into a prime (21430127023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3437266 + ... + 3443494.

It is an arithmetic number, because the mean of its divisors is an integer number (649570950).

Almost surely, 2^21430127020 is an apocalyptic number.

21430127020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21430127020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23384554200).

21430127020 is an abundant number, since it is smaller than the sum of its proper divisors (25338981380).

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

21430127020 is a wasteful number, since it uses less digits than its factorization.

21430127020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6479 (or 6446 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The spelling of 21430127020 in words is "twenty-one billion, four hundred thirty million, one hundred twenty-seven thousand, twenty".