1253121402 has 64 divisors (see below), whose sum is σ = 2917998720. Its totient is φ = 355394304.

The previous prime is 1253121361. The next prime is 1253121403. The reversal of 1253121402 is 2041213521.

It is not an unprimeable number, because it can be changed into a prime (1253121403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43408 + ... + 66260.

It is an arithmetic number, because the mean of its divisors is an integer number (45593730).

Almost surely, 2^1253121402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1253121402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1458999360).

1253121402 is an abundant number, since it is smaller than the sum of its proper divisors (1664877318).

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

1253121402 is a wasteful number, since it uses less digits than its factorization.

1253121402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22927.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1253121402 is about 35399.4548263105. The cubic root of 1253121402 is about 1078.1132472703.

Adding to 1253121402 its reverse (2041213521), we get a palindrome (3294334923).

It can be divided in two parts, 12531 and 21402, that added together give a palindrome (33933).

The spelling of 1253121402 in words is "one billion, two hundred fifty-three million, one hundred twenty-one thousand, four hundred two".