212020639 has 4 divisors (see below), whose sum is σ = 223179640. Its totient is φ = 200861640.

The previous prime is 212020637. The next prime is 212020643. The reversal of 212020639 is 936020212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212020639 - 2¹ = 212020637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5579472 + ... + 5579509.

It is an arithmetic number, because the mean of its divisors is an integer number (55794910).

Almost surely, 2^212020639 is an apocalyptic number.

212020639 is a deficient number, since it is larger than the sum of its proper divisors (11159001).

212020639 is a wasteful number, since it uses less digits than its factorization.

212020639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159000.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 212020639 is about 14560.9285074819. The cubic root of 212020639 is about 596.2925449617.

The spelling of 212020639 in words is "two hundred twelve million, twenty thousand, six hundred thirty-nine".