694041021 has 16 divisors (see below), whose sum is σ = 1063665600. Its totient is φ = 446738544.

The previous prime is 694041017. The next prime is 694041037. The reversal of 694041021 is 120140496.

694041021 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 694041021 - 2² = 694041017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694041011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442411 + ... + 443976.

It is an arithmetic number, because the mean of its divisors is an integer number (66479100).

Almost surely, 2^694041021 is an apocalyptic number.

It is an amenable number.

694041021 is a deficient number, since it is larger than the sum of its proper divisors (369624579).

694041021 is a wasteful number, since it uses less digits than its factorization.

694041021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886425 (or 886419 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 694041021 is about 26344.6583010674. The cubic root of 694041021 is about 885.3772938833.

It can be divided in two parts, 6940 and 41021, that added together give a square (47961 = 219²).

The spelling of 694041021 in words is "six hundred ninety-four million, forty-one thousand, twenty-one".