207221691390 has 192 divisors, whose sum is σ = 628625111040. Its totient is φ = 43424398080.

The previous prime is 207221691377. The next prime is 207221691407. The reversal of 207221691390 is 93196122702.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 746164 + ... + 985496.

It is an arithmetic number, because the mean of its divisors is an integer number (3274089120).

Almost surely, 2^207221691390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 207221691390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314312555520).

207221691390 is an abundant number, since it is smaller than the sum of its proper divisors (421403419650).

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

207221691390 is a wasteful number, since it uses less digits than its factorization.

207221691390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239407 (or 239400 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 207221691390 in words is "two hundred seven billion, two hundred twenty-one million, six hundred ninety-one thousand, three hundred ninety".