216931402 has 4 divisors (see below), whose sum is σ = 325397106. Its totient is φ = 108465700.

The previous prime is 216931381. The next prime is 216931409. The reversal of 216931402 is 204139612.

216931402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 132273001 + 84658401 = 11501^2 + 9201^2 .

It is not an unprimeable number, because it can be changed into a prime (216931409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54232849 + ... + 54232852.

Almost surely, 2^216931402 is an apocalyptic number.

216931402 is a deficient number, since it is larger than the sum of its proper divisors (108465704).

216931402 is a wasteful number, since it uses less digits than its factorization.

216931402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108465703.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 216931402 is about 14728.5913107805. The cubic root of 216931402 is about 600.8611726374.

The spelling of 216931402 in words is "two hundred sixteen million, nine hundred thirty-one thousand, four hundred two".