421220402 has 4 divisors (see below), whose sum is σ = 631830606. Its totient is φ = 210610200.

The previous prime is 421220383. The next prime is 421220417. The reversal of 421220402 is 204022124.

It is a happy number.

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., 291009481 + 130210921 = 17059^2 + 11411^2 .

It is a super-2 number, since 2×421220402² = 354853254122083208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105305099 + ... + 105305102.

Almost surely, 2^421220402 is an apocalyptic number.

421220402 is a deficient number, since it is larger than the sum of its proper divisors (210610204).

421220402 is a wasteful number, since it uses less digits than its factorization.

421220402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210610203.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 421220402 is about 20523.6546940354. The cubic root of 421220402 is about 749.6118892688.

Adding to 421220402 its reverse (204022124), we get a palindrome (625242526).

The spelling of 421220402 in words is "four hundred twenty-one million, two hundred twenty thousand, four hundred two".