1252421213402 has 4 divisors (see below), whose sum is σ = 1878631820106. Its totient is φ = 626210606700.

The previous prime is 1252421213401. The next prime is 1252421213413. The reversal of 1252421213402 is 2043121242521.

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., 1250239295881 + 2181917521 = 1118141^2 + 46711^2 .

It is a super-3 number, since 3×1252421213402³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1252421213401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313105303349 + ... + 313105303352.

Almost surely, 2^{1252421213402} is an apocalyptic number.

1252421213402 is a deficient number, since it is larger than the sum of its proper divisors (626210606704).

1252421213402 is an equidigital number, since it uses as much as digits as its factorization.

1252421213402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626210606703.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 1252421213402 its reverse (2043121242521), we get a palindrome (3295542455923).

The spelling of 1252421213402 in words is "one trillion, two hundred fifty-two billion, four hundred twenty-one million, two hundred thirteen thousand, four hundred two".