21150420435 has 32 divisors (see below), whose sum is σ = 37607127360. Its totient is φ = 11278310400.

The previous prime is 21150420419. The next prime is 21150420479. The reversal of 21150420435 is 53402405112.

It is not a de Polignac number, because 21150420435 - 2⁴ = 21150420419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21150420399 and 21150420408.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1181955 + ... + 1199715.

It is an arithmetic number, because the mean of its divisors is an integer number (1175222730).

Almost surely, 2^21150420435 is an apocalyptic number.

21150420435 is a deficient number, since it is larger than the sum of its proper divisors (16456706925).

21150420435 is a wasteful number, since it uses less digits than its factorization.

21150420435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26596 (or 26590 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21150420435 its reverse (53402405112), we get a palindrome (74552825547).

The spelling of 21150420435 in words is "twenty-one billion, one hundred fifty million, four hundred twenty thousand, four hundred thirty-five".