210421402 has 4 divisors (see below), whose sum is σ = 315632106. Its totient is φ = 105210700.

The previous prime is 210421363. The next prime is 210421417. The reversal of 210421402 is 204124012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 159997201 + 50424201 = 12649^2 + 7101^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52605349 + ... + 52605352.

Almost surely, 2^210421402 is an apocalyptic number.

210421402 is a deficient number, since it is larger than the sum of its proper divisors (105210704).

210421402 is a wasteful number, since it uses less digits than its factorization.

210421402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105210703.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 210421402 is about 14505.9092096980. The cubic root of 210421402 is about 594.7895138535.

Adding to 210421402 its reverse (204124012), we get a palindrome (414545414).

The spelling of 210421402 in words is "two hundred ten million, four hundred twenty-one thousand, four hundred two".