697200021 has 32 divisors (see below), whose sum is σ = 1205575680. Its totient is φ = 389918448.

The previous prime is 697200011. The next prime is 697200029. The reversal of 697200021 is 120002796.

It is not a de Polignac number, because 697200021 - 2¹⁷ = 697068949 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697200029) 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, 30361 + ... + 48126.

It is an arithmetic number, because the mean of its divisors is an integer number (37674240).

Almost surely, 2^697200021 is an apocalyptic number.

It is an amenable number.

697200021 is a deficient number, since it is larger than the sum of its proper divisors (508375659).

697200021 is a wasteful number, since it uses less digits than its factorization.

697200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78550 (or 78544 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 697200021 is about 26404.5454609618. The cubic root of 697200021 is about 886.7185566299.

The spelling of 697200021 in words is "six hundred ninety-seven million, two hundred thousand, twenty-one".