212040139 has 2 divisors, whose sum is σ = 212040140. Its totient is φ = 212040138.

The previous prime is 212040131. The next prime is 212040149. The reversal of 212040139 is 931040212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212040139 - 2³ = 212040131 is a prime.

It is a super-2 number, since 2×212040139² = 89922041094278642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212040131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106020069 + 106020070.

It is an arithmetic number, because the mean of its divisors is an integer number (106020070).

Almost surely, 2^212040139 is an apocalyptic number.

212040139 is a deficient number, since it is larger than the sum of its proper divisors (1).

212040139 is an equidigital number, since it uses as much as digits as its factorization.

212040139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 212040139 is about 14561.5980922425. The cubic root of 212040139 is about 596.3108251760.

The spelling of 212040139 in words is "two hundred twelve million, forty thousand, one hundred thirty-nine".