2131220402 has 32 divisors (see below), whose sum is σ = 3416878080. Its totient is φ = 993496320.

The previous prime is 2131220383. The next prime is 2131220407. The reversal of 2131220402 is 2040221312.

It is a super-3 number, since 3×2131220402³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (2131220407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1993124 + ... + 1994192.

It is an arithmetic number, because the mean of its divisors is an integer number (106777440).

Almost surely, 2^2131220402 is an apocalyptic number.

2131220402 is a deficient number, since it is larger than the sum of its proper divisors (1285657678).

2131220402 is a wasteful number, since it uses less digits than its factorization.

2131220402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2131220402 is about 46165.1427161230. The cubic root of 2131220402 is about 1286.8940364232.

Adding to 2131220402 its reverse (2040221312), we get a palindrome (4171441714).

It can be divided in two parts, 21312 and 20402, that added together give a palindrome (41714).

The spelling of 2131220402 in words is "two billion, one hundred thirty-one million, two hundred twenty thousand, four hundred two".