21020220024 has 16 divisors (see below), whose sum is σ = 52550550120. Its totient is φ = 7006740000.

The previous prime is 21020219963. The next prime is 21020220037. The reversal of 21020220024 is 42002202012.

It is a super-3 number, since 3×21020220024³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020219985 and 21020220012.

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, 437921227 + ... + 437921274.

Almost surely, 2^21020220024 is an apocalyptic number.

21020220024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21020220024 is an abundant number, since it is smaller than the sum of its proper divisors (31530330096).

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

21020220024 is a wasteful number, since it uses less digits than its factorization.

21020220024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875842510 (or 875842506 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21020220024 its reverse (42002202012), we get a palindrome (63022422036).

The spelling of 21020220024 in words is "twenty-one billion, twenty million, two hundred twenty thousand, twenty-four".