6421071572 has 6 divisors (see below), whose sum is σ = 11236875258. Its totient is φ = 3210535784.

The previous prime is 6421071557. The next prime is 6421071583. The reversal of 6421071572 is 2751701246.

It can be written as a sum of positive squares in only one way, i.e., 5114538256 + 1306533316 = 71516^2 + 36146^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802633943 + ... + 802633950.

It is an arithmetic number, because the mean of its divisors is an integer number (1872812543).

Almost surely, 2^6421071572 is an apocalyptic number.

It is an amenable number.

6421071572 is a deficient number, since it is larger than the sum of its proper divisors (4815803686).

6421071572 is a wasteful number, since it uses less digits than its factorization.

6421071572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605267897 (or 1605267895 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 6421071572 is about 80131.5891019266. The cubic root of 6421071572 is about 1858.6709173987.

The spelling of 6421071572 in words is "six billion, four hundred twenty-one million, seventy-one thousand, five hundred seventy-two".