2157021070 has 16 divisors (see below), whose sum is σ = 3977337168. Its totient is φ = 841764160.

The previous prime is 2157021067. The next prime is 2157021071. The reversal of 2157021070 is 701207512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157021071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2630104 + ... + 2630923.

It is an arithmetic number, because the mean of its divisors is an integer number (248583573).

Almost surely, 2^2157021070 is an apocalyptic number.

2157021070 is a deficient number, since it is larger than the sum of its proper divisors (1820316098).

2157021070 is a wasteful number, since it uses less digits than its factorization.

2157021070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261075.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 2157021070 is about 46443.7409130660. The cubic root of 2157021070 is about 1292.0662896876.

Adding to 2157021070 its reverse (701207512), we get a palindrome (2858228582).

The spelling of 2157021070 in words is "two billion, one hundred fifty-seven million, twenty-one thousand, seventy".