21060234 has 24 divisors (see below), whose sum is σ = 49141092. Its totient is φ = 6480000.

The previous prime is 21060211. The next prime is 21060257. The reversal of 21060234 is 43206012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21060211) and next prime (21060257).

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 783225 = 4503^2 + 885^2 .

It is a super-2 number, since 2×21060234² = 887066912269512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44767 + ... + 45234.

Almost surely, 2^21060234 is an apocalyptic number.

21060234 is an abundant number, since it is smaller than the sum of its proper divisors (28080858).

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

21060234 is a wasteful number, since it uses less digits than its factorization.

21060234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90022 (or 90019 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21060234 is about 4589.1430572603. The cubic root of 21060234 is about 276.1559452677.

Adding to 21060234 its reverse (43206012), we get a palindrome (64266246).

The spelling of 21060234 in words is "twenty-one million, sixty thousand, two hundred thirty-four".