10691421 has 8 divisors (see below), whose sum is σ = 15351840. Its totient is φ = 6579312.

The previous prime is 10691399. The next prime is 10691431. The reversal of 10691421 is 12419601.

10691421 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10691421 - 2⁷ = 10691293 is a prime.

It is a super-2 number, since 2×10691421² = 228612965998482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10691391 and 10691400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10691431) 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, 137031 + ... + 137108.

It is an arithmetic number, because the mean of its divisors is an integer number (1918980).

Almost surely, 2^10691421 is an apocalyptic number.

It is an amenable number.

10691421 is a deficient number, since it is larger than the sum of its proper divisors (4660419).

10691421 is a wasteful number, since it uses less digits than its factorization.

10691421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274155.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 10691421 is about 3269.7738453905. The cubic root of 10691421 is about 220.2986371339.

The spelling of 10691421 in words is "ten million, six hundred ninety-one thousand, four hundred twenty-one".