21004220035 has 96 divisors (see below), whose sum is σ = 29579157504. Its totient is φ = 14249088000.

The previous prime is 21004220033. The next prime is 21004220071. The reversal of 21004220035 is 53002240012.

It is not a de Polignac number, because 21004220035 - 2¹ = 21004220033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004219994 and 21004220021.

It is not an unprimeable number, because it can be changed into a prime (21004220033) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 67537530 + ... + 67537840.

It is an arithmetic number, because the mean of its divisors is an integer number (308116224).

Almost surely, 2^21004220035 is an apocalyptic number.

21004220035 is a deficient number, since it is larger than the sum of its proper divisors (8574937469).

21004220035 is a wasteful number, since it uses less digits than its factorization.

21004220035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21004220035 its reverse (53002240012), we get a palindrome (74006460047).

The spelling of 21004220035 in words is "twenty-one billion, four million, two hundred twenty thousand, thirty-five".