2121690402 has 128 divisors (see below), whose sum is σ = 5316192000. Its totient is φ = 622702080.

The previous prime is 2121690353. The next prime is 2121690419. The reversal of 2121690402 is 2040961212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1811277 + ... + 1812447.

It is an arithmetic number, because the mean of its divisors is an integer number (41532750).

Almost surely, 2^2121690402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121690402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2658096000).

2121690402 is an abundant number, since it is smaller than the sum of its proper divisors (3194501598).

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

2121690402 is a wasteful number, since it uses less digits than its factorization.

2121690402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313 (or 1307 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2121690402 is about 46061.8106678407. The cubic root of 2121690402 is about 1284.9730047269.

The spelling of 2121690402 in words is "two billion, one hundred twenty-one million, six hundred ninety thousand, four hundred two".