2187121402 has 12 divisors (see below), whose sum is σ = 3287994606. Its totient is φ = 1091126400.

The previous prime is 2187121397. The next prime is 2187121423. The reversal of 2187121402 is 2041217812.

2187121402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2018615041 + 168506361 = 44929^2 + 12981^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1750474 + ... + 1751722.

Almost surely, 2^2187121402 is an apocalyptic number.

2187121402 is a deficient number, since it is larger than the sum of its proper divisors (1100873204).

2187121402 is an frugal number, since it uses more digits than its factorization.

2187121402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2187121402 is about 46766.6697766689. The cubic root of 2187121402 is about 1298.0486309368.

The spelling of 2187121402 in words is "two billion, one hundred eighty-seven million, one hundred twenty-one thousand, four hundred two".