421020401402 has 4 divisors (see below), whose sum is σ = 631530602106. Its totient is φ = 210510200700.

The previous prime is 421020401377. The next prime is 421020401423. The reversal of 421020401402 is 204104020124.

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., 381678075601 + 39342325801 = 617801^2 + 198349^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105255100349 + ... + 105255100352.

Almost surely, 2^421020401402 is an apocalyptic number.

421020401402 is a deficient number, since it is larger than the sum of its proper divisors (210510200704).

421020401402 is a wasteful number, since it uses less digits than its factorization.

421020401402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210510200703.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 421020401402 its reverse (204104020124), we get a palindrome (625124421526).

The spelling of 421020401402 in words is "four hundred twenty-one billion, twenty million, four hundred one thousand, four hundred two".