21435051 has 16 divisors (see below), whose sum is σ = 31409280. Its totient is φ = 12894720.

The previous prime is 21435049. The next prime is 21435061. The reversal of 21435051 is 15053412.

It is not a de Polignac number, because 21435051 - 2¹ = 21435049 is a prime.

It is a super-2 number, since 2×21435051² = 918922822745202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21435061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2251 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (1963080).

Almost surely, 2^21435051 is an apocalyptic number.

21435051 is a deficient number, since it is larger than the sum of its proper divisors (9974229).

21435051 is a wasteful number, since it uses less digits than its factorization.

21435051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4826.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21435051 is about 4629.8003196682. The cubic root of 21435051 is about 277.7846053374.

Adding to 21435051 its reverse (15053412), we get a palindrome (36488463).

The spelling of 21435051 in words is "twenty-one million, four hundred thirty-five thousand, fifty-one".