69801021 has 42 divisors (see below), whose sum is σ = 110006078. Its totient is φ = 44264880.

The previous prime is 69800977. The next prime is 69801049. The reversal of 69801021 is 12010896.

It can be written as a sum of positive squares in only one way, i.e., 38564100 + 31236921 = 6210^2 + 5589^2 .

It is not a de Polignac number, because 69801021 - 2⁶ = 69800957 is a prime.

It is a super-4 number, since 4×69801021⁴ (a number of 32 digits) contains 4444 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69801821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 385551 + ... + 385731.

Almost surely, 2^69801021 is an apocalyptic number.

It is an amenable number.

69801021 is a deficient number, since it is larger than the sum of its proper divisors (40205057).

69801021 is an equidigital number, since it uses as much as digits as its factorization.

69801021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 69801021 is about 8354.7005332328. The cubic root of 69801021 is about 411.7376597574.

It can be divided in two parts, 6980 and 1021, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 69801021 in words is "sixty-nine million, eight hundred one thousand, twenty-one".