213490723720 has 128 divisors (see below), whose sum is σ = 523905148800. Its totient is φ = 78017458176.

The previous prime is 213490723703. The next prime is 213490723727. The reversal of 213490723720 is 27327094312.

It is a happy number.

It is a super-2 number, since 2×213490723720² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (213490723727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3143967 + ... + 3211153.

It is an arithmetic number, because the mean of its divisors is an integer number (4093008975).

Almost surely, 2^213490723720 is an apocalyptic number.

213490723720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213490723720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261952574400).

213490723720 is an abundant number, since it is smaller than the sum of its proper divisors (310414425080).

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

213490723720 is a wasteful number, since it uses less digits than its factorization.

213490723720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67367 (or 67363 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 213490723720 in words is "two hundred thirteen billion, four hundred ninety million, seven hundred twenty-three thousand, seven hundred twenty".